nik ritza kosai nik mahmood.  (2023).  kitakurang-obesity management programme that helps malaysians live healthier, happier and fuller lives.  - kl happening events.  1-3. 

mohamed arif hameed sultan, muhamad hud muhamad zin, firdaus hayati, zulkifli md zainuddin, nik ritza kosai, reynu rajan, zainal adwin zainal abidin, dayang corieza febriany.  (2023).  improvement in erectile dysfunction among male obese patient, following bariatric surgery in hospital canselor tuanku muhriz (hukm).  - obesity surgery.  1506-1518. 

nik ritza kosai nik mahmood.  (2023).  how a balloon can help obese persons lose weight.  - the star.  1-7. 

alfizah hanafiah, asif sukri, nik ritza kosai, mohamad aznan shuhaili, mustafa mohammed taher & raja affendi raja ali.  (2023).  immunophenotyping of gastritis, gastric ulcer and gastric cancer using a cluster of differentiation (cd) antibody microarray.  - sains malaysiana.  187-197. 

hajar rubihah dzaraly, syarifah noor nazihah sayed masri, khairulamir zainuddin, nik ritza kosai nik mahmood, maryam budiman, azarinah izaham.  (2023).  the effect of moderate versus deep neuromuscular blockade on the surgical rating scale in laparoscopic sleeve gastrectomy in a malaysian tertiary university hospital: a randomised clinical trial.  - malaysian journal of anaesthesiology.  118-133. 

mza zainuddin, j che hamzah, nr kosai, tc cheng, bastion mlc.  (2023).  nutritional optic neuropathy - bariatric surgery gone wrong.  - 12th conjoint ophthalmology scientific conference.  1-2. 

loo guo hoo, nadia nafsha baharudin, mohamed arif hameed sultan, reynu rajan, nik ritza kosai, lizawati rasul hamidi.  (2023).  adult idiopathic hypertrophic pyloric stenosis presenting with gastroduodenal intussusception: a rare case report.  - turkish journal of surgery.  377-382. 

mohd haidir roslan, mohd asyiq raffali, shawal faizal mohamad, nik ritza kosai nik mahmood, hamat hamdi che hassan.  (2023).  cardiac and metabolic effects of bariatric surgery among obese patients in a malaysian tertiary hospital: a 6-month prospective cohort study.  - journal of the asean federation of endocrine societies.  1-7. 

nik ritza kosai nik mahmooh.  (2023).  pembedahan bariatrik rawat obes sahaja.  - metro ahad.  3. 

lee qz, nik ritza k, mohd firdaus ca, muhammad m.  (2023).  the impact of laparoscopic intraperitoneal instillation of ropivacaine in enhancing respiratory recovery and reducing acute postoperative pain in laparoscopic sleeve gastrectomy: a double-blinded randomised control; relieve trial.  - obesity surgery.  3141-3146. 

asif sukri, alfizah hanafiah, nik ritza kosai.  (2023).  cd54, cd55 and cd71 regulate interleukin-8 secretion of helicobacter pylori-infected gastric epithelial cells in strain-dependent manner.  - simposium biologi kebangsaan 2023.  1. 

nur izreena ismail, khairul najmi muhammad nawawi, deborah chew chia hsin, kok wei hao, nik ritza kosai nik mahmood, gary lee chong chearn, zhiqin wong, azmi mohd tamil, hazel joseph, raja affendi raja ali.  (2023).  probiotic containing lactobacillus reuteri dsm 17648 as an adjunct treatment for helicobacter pylori infection: a randomized, double- blind, placebo- controlled trial.  - helicobacter.  1-11. 

mohamed arif hameed sultan, nik ritza kosai, reynu rajan, mustafa taher, aznan shuhaili, dayang corieza febriany.  (2023).  malignant melanoma of oesophagus: a rare entity.  - gazi medical journal.  82-85. 

nik ritza kosai.  (2023).  alternatif turunkan berat badan: kaedah bariatrik, belon intragastrik bantu kawal obesiti.  - berita harian.  25. 

nik ritza kosai nik mahmood.  (2023).  the business station (bfm).  - what do intragastric balloons offer in obesity management?.  . 

masayuki o, soo min a, yosuke s, wah y, simon kin hw, suthep u, jefrey m. h, manish k, nik ritza k, weu w, june l, reno r, thejana w, edward o.  (2022).  ten years of change in bariatric/metabolic surgery in the asia-pacific region with covid-19 pandemic: ifso-apc national reports 2021.  - obesity surgery.  2994-3004. 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohammed taher, ramelah mohamed.  (2022).  new insight on the role of helicobacter pylori caga in the expression of cell surface antigens with important biological functions in gastric carcinogenesis.  - helicobacter.  1-8. 

raymond zml, hans am, malaysian upper gastrointestinal surgical society (mugis), ng cb, low ky, sekkapan t, ngo cw, nik ritza kosai, reynu r, mohamad as, ahmad sudiman ms, ramesh g, azrina ab, mahadevan dt, vijaya sa, wan najmi wd, lim sy, kelvin v, moha.  (2022).  esophageal squamous cell carcinoma and adenocarcinoma in malaysia - pooled data from upper gastrointestinal centers in a multiethnic asian population.  - cancer epidemiology.  1-8. 

mohanraj t, nik ritza kosai.  (2022).  predictors associated with morbidity of ureteral stent related symptoms (srs) in patients with in-dwelling ureteric stents in hospital serdang.  - assessment of dissertation defense day.  21. 

nik ritza kosai, raja affendi raja ali.  (2022).  global multi-stakeholder endorsement of the mafld definition.  - the lancet gastroenterology and hepatology.  388-390. 

david gan, nik ritza kosai.  (2022).  performance and diagnostic accuracy of scoring systems in patients with suspected adult appendicitis.  - assessment of dissertation defense day.  25. 

syarifah nafisah al-yahya, muhammad haffiz haslam mohamed akram, kasturi vijaya kumar, siti nor asyrah mat amin, noor alifah abdul malik, nor ain mohd zawawi, nik ritza kosai nik mahmood,norlaila mustafa, mawaddah azman, and marina mat baki.  (2022).  maximum phonation time normative values among malaysians and its relation to body mass index.  - journal of voice.  457-463. 

nik ritza kosai nik mahmood.  (2022).  'sentuhan emas' dr nik ritza kosai.  - harian metro.  1-7. 

nur izreena ismail, raja affendi raja ali, zhiqin wong, khairul najmi muhammad nawawi, wei hao kok, nik ritza kosai nik mahmood, chia hsin chew, chong chearn lee, azmi mohd tamil, hazel joseph.  (2022).  the effect of lactobacillus reuteri probiotic as an adjunct treatment for helicobacter pylori infection in adults.  - gut.  1. 

nabilah hisham, alfizah hanafiah, tan geok chin, nik ritza kosai, muaatamarulain mustangin.  (2022).  detection of expressed pro-inflammatory cytokine interleukin-32 in gastric cancer patients from ukm medical centre (ukmmc) using immunohistochemistry (ihc).  - gut 2022.  1. 

wah-kheong chan, soek-siam tan, siew-pheng chan, yeong-yeh lee, hoi-poh tee, sanjiv m., khean-lee goh, anis safura ramli, feisul m., nik ritza k. dan raja affendi ra.  (2022).  malaysian society of gastroenterology and hepatology consensus statement on metabolic dysfunction-associated fatty liver disease.  - gastroenterology and hepatology.  795-811. 

asif sukri, alfizah hanafiah, and nik ritza kosai.  (2022).  the roles of immune cells in gastric cancer: anti-cancer or pro-cancer?.  - cancers.  1-14. 

nik ritza kosai nik mahmood , muhammad maaya , lee qi zheng.  (2022).  the role of lntraperitoneal instillation of local anaesthesia (ropivacaine) for postoperative pain management in laparoscopic sleeve gastrectomy surgery (lsgs):rosle randomised controlled trial.  - assessment of dissertation defense day.  30. 

zahra rashidbenam, mohd hafidzul jasman, guan hee tan, eng hong goh, xeng inn fam, christopher chee kong ho, zulkifli md zainuddin, reynu rajan, rizal abdul rani, fatimah mohd nor, mohamad aznan shuhaili, nik ritza kosai, farrah hani imran, min hwei ng.  (2021).  fabrication of adipose-derived stem cell-based self-assembled scaffold under hypoxia and mechanical stimulation for urethral tissue engineering.  - international journal of molecular sciences.  1-32. 

anivat ai pun, loo guo hou, reynu rajan, nik ritza kosai, norlela sukor.  (2021).  laparoscopic sleeve gastrectomy vs roux-en-y gastric bypass in the remission of type 2 diabetes mellitus: early results from a bariatric centre in malaysia.  - journal of medical and surgical research.  886-894. 

nik ritza kosai nik mahmood.  (2021).  what to know about obesity in malaysia.  - tatler malaysia.  1. 

nik ritza kosai nik mahmood, hardip singh gendeh, mardiana mardan.  (2021).  managing diabetes through surgery.  - the health.  14-15. 

alfizah hanafiah, nabilah hisham, tan geok chin, muaatamarulain mustangin, nik ritza kosai nik mahmood.  (2021).  expression of interleukin-32 in gastric cancer patients in ukm medical centre (ukmmc).  - .  1-5. 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohamed taher, isa mohamed rose.  (2021).  cluster of differentiation (cd) antigens as biomarkers for prognosis of different subtypes of gastric cancer: a preliminary study.  - precision health in industrial revolution 4.0 (ir 4.0): the technologies and health transformation.  20. 

muhamad hud muhamad zin, theevashini krishnasamy, nik ritza kosai.  (2021).  retro umbilical abscess mimicking infected urachal cyst: a rare presentation from migratory fish bone ingestion.  - gazi medical journal.  466-468. 

abdul gafoor am, reynu r, kirubakaran m, vimal kv, nik ritza kosai nm, tikfu g, haron a.  (2021).  patient and procedure selection for bariatric and metabolic surgery in malaysia- the malaysian consensus.  - medical journal of malaysia.  229-232. 

dalilah diyana alfian sulai, theevashini k, nik ritza kosai nik mahmood.  (2021).  diagnostic challenge in silent metastatic invasive breast carcinoma: dysphagia as the only symptom.  - bmj case report.  1-3. 

mawaddah azman, ng sze yin, abdullah sani mohamed, marina mat baki, mustafa mohammed taher, nik ritza kosai.  (2021).  surgical versus conventional weight loss therapy for obstructive sleep apnea, a randomized controlled trial: quantitative and qualitative outcome.  - medical journal of malaysia.  23. 

ahmad adib bin mohd nasir, andrea yu-lin ban, syed zulkifli syed zakaria, nik ritza kosai nik mahmood and mohamed faisal abdul hamid.  (2021).  a single tertiary centre outlook on the short-term outcome of bariatric surgery in improving pulmonary parameters and sleep apnoea.  - proceedings of singapore healthcare.  91-98. 

kavitha subramanian, low wy, lau pc, chin kf, chinna k, nik ritza kosai, mustafa taher, reynu r.  (2021).  changes in eating behaviours following bariatric surgery: a prospective study.  - journal of experimental biology and agricultural sciences.  101-109. 

pei pei lee,theevashini krishnasamy, mustafa taher, nik ritza kosai nik mahmood.  (2020).  partially eroded gastric band after 13 years - endoscopic removal with emergency lithotripter device.  - surgical chronicles.  44-46. 

reynu rajan, mohammed sam-aan, nik ritza kosai, mohamad aznan shuhaili, tee sze chee, ajay venkateswaran, kamal mahawar.  (2020).  early outcome of bariatric surgery for the treatment of type 2 diabetes mellitus in super-obese malaysian population.  - journal of minimal access surgery.  47-53. 

loo guo hoo, reynu rajan, mahadevan deva tata, nik ritza kosai.  (2020).  changes in the disease-specific quality of life following dor fundoplication. a multicentre cross-sectional study.  - annals of medicine and surgery.  252-255. 

sivesh kk., sheraz rm., pritam s., ewan ag., on behalf of oeasophagogastric anastomosis audit group.  (2020).  the influence of the sars-cov-2 pandemic on esophagogastric cancer services: an international survey of esophagogastric surgeons.  - diseases of the esophagus.  1-12. 

loo guo hou, reynu rajan, azmi mohd tamil, nik ritza kosai.  (2020).  prevalence of obstructive sleep apnea in asian bariatric population: an underdiagnosed dilemma.  - surgery for obesity and related disease.  778-783. 

chua shiau ying, loo guo hou, azarinah izaham, reynu rajan, zuraidah che man, esa kamaruzaman, nik ritza kosai.  (2020).  non-invasive versus invasive blood pressure monitoring in patients during laparoscopic bariatric surgery: a prospective method-comparison study.  - journal of medical and surgical research.  778-791. 

mohd hafidzul bin jasman;zulkifli bin md. zainuddin;goh eng hong;ng min hwei;fam xeng inn;tan guan hee;reynu a/p rajan;nik ritza kosai bin nik mahmood;mohamad aznan bin shuhaili;fatimah binti mohd nor.  (2020).  exploring the role of modified adipose derived stem cell-based self-assembled scaffold in the engineering of full thickness human urethra.  - .  . 

nik ritza kosai nik mahmood, hardip singh gendeh, mardiana mardan.  (2020).  the health.  - obesity a serious risk factor in covid-19.  16-17. 

surita binti said, guo hou loo, nik ritza kosai, reynu rajan, rozita mohd, asrul abdul wahab, shamsul azhar shah.  (2020).  reduction in urinary chemokine (c-c motif) ligand 2 (ccl-2) after surgery-induced weight loss.  - scientific reports.  1-6. 

jimmy bys, jiafu j, sang uk, masanori t, guoxin li, hh kim, simon l, asim s, kyo ys, woo jh, nik ritza kosai, koji k, kazunari m, hiroshi y, takahiro k, peng cl, young wk, jaideeraj r, bee ct, hk yang, expel study group.  (2020).  extensive peritoneal lavage after curative gastrectomy for gastric cancer study (expel): an international multicenter randomized controlled trial.  - journal of clinical oncology.  279. 

asif sukri, alfizah hanafiah, noraziah mohamad zin, nik ritza kosai.  (2020).  epidemiology and role of helicobacter pylori virulence factors in gastric cancer carcinogenesis.  - apmis.  150-161. 

fatin hanani mazri, suzana shahar, nik ritza kosai, mohd azahadi omar, nilsiswati ramilis & reynu rajan.  (2019).  a retrospective study of weight-loss predictors following bariatric surgery in malaysian patients with obesity.  - malaysian journal of nutrition.  423-433. 

lai jun hai, loo guo hou, mohamad aznan shuhaili, nik ritza kosai.  (2019).  a novel alternative to suture passer for closure of fascial defect in laparoscopic ventral hernia repair: a case report.  - international journal of surgery case reports.  276-280. 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohamed taher, isa mohamed rose & ramelah mohamed.  (2019).  optimization of cryopreserved single cell suspension of gastric epithelial cells for successful dotscantm antibody microarray.  - sains malaysiana.  1105-1110. 

alfizah binti hanafiah;nik ritza kosai bin nik mahmood;raja affendi bin raja ali;mustafa mohammed taher;isa b mohamed rose.  (2019).  analysis of cluster of differentiation (cd) antigens in h. pylori-associated gastric cancer and non-gastric cancer.  - .  1-6. 

zahra rashidbenam, mohd hafidzul jasman, pezhman hafez, guan hee tan, eng hong goh, xeng inn fam, christopher chee kong ho, zulkifli md zainuddin, reynu rajan, fatimah mohd nor,mohamad aznan shuhaili, nik ritza kosai, farrah hani imran, min hwei ng.  (2019).  overview of urethral reconstruction by tissue engineering: current strategies, clinical status and future direction.  - tissue engineering and regenerative medicine.  365-384. 

globalsurg collaborative; dayang nita abdul aziz, reynu rajan, mohammed taher, nik ritza kosai.  (2019).  pooled analysis of who surgical safety checklist use and mortality after emergency laparotomy.  - british journal of surgery.  103-112. 

loo guo hou, anusha prabakaran, reynu rajan, fatimah binti mohd nor, nik ritza kosai.  (2019).  concurrent bariatric surgery and surgical resection of massive localized lymphedema of the thigh. a case report..  - annals of medicine and surgery.  53-56. 

globalsurg collaborative (nik ritza kosai, reynu rajan, mustafa mohamed taher, dayang nita abdul aziz).  (2019).  global variation in anastomosis and end colostomy formation following left-sided colorectal resection.  - bjs open.  403-414. 

nik ritza kosai nik mahmood.  (2019).  cutting away obesity.  - the health.  14-15. 

amir am, iman g, mustafa mt, nik ritza k.  (2019).  ebv-positive gastric carcinoma with lymphoid stroma: a novel variant gastric neoplasm predicting good patient's prognosis.  - surgical chronicles.  82-84. 

juhanis fj, reynu r, mustafa mt, mohd aznan s, iman g, nik ritza k.  (2019).  internal hernia after roux en y gastric bypass: a paradigm shift of practice.  - surgical chronicles.  140-143. 

nadiah rosly, loo guo hou, mohamad aznan shuhaili, reynu rajan, nik ritza kosai.  (2019).  oesophageal perforation following transoesophageal echocardiography: a case report on successful conservative management.  - international journal of surgery case reports.  161-164. 

sivaneswaran lechmiannandan, mayurran panirselvam, prema muninathan, narwani hussin, reynu rajan, hatta sidi, nik ritza kosai & c. rajkumar vinayak.  (2019).  resolution of female sexual dysfunction (fsd) among the obese multiethnic malaysian women now a reality with bariatric surgery: a prospective pilot study in malaysia.  - obesity surgery.  1571-1575. 

loo gou hou, reynu rajan, nik ritza kosai nik mahmood.  (2019).  staple-line post primary sleeve gastrectomy. a two patient case series and literature review.  - annals of medicine and surgery.  72-76. 

diana mellisa dualim, loo guo hou, reynu rajan. nik ritza kosai nik mahmood.  (2019).  jejunal gist: hunting down an unusual cause of gastrointestinal bleed using double balloon enteroscopy. a case report.  - international journal of surgery case report.  303-306. 

globalsurg collaborative, dayang nita abdul aziz, mustafa mohamed, reynu rajan, nik ritza kosai..  (2018).  management and outcomes following surgery for gastrointestinal typhoid: an international, prospective, multicentre cohort study.  - world journal of surgery.  . 

globalsurg collaborative, nik ritza kosai, mustafa taher, reynu rajan.  (2018).  laparoscopy in management of appendicitis in high-, middle-, and low-income countries: a multicenter, prospective, cohort study.  - surgical endoscopy.  . 

m. azman, n. sze yin, m mat baki, a. sani, n.r. kosai.  (2018).  surgical versus conventional weight loss therapy for obstructive sleep apnea, a randomized controlled trial: quantitative and qualitative outcome.  - 9th isss international surgical sleep society meeting.  . 

hassan s, kosai nr, reynu r, shuhaili ma, sutton pa, smith dc.  (2018).  extensive rectus sheath hematoma secondary to erroneous technique of anticoagulant injection.  - medicine & health.  291-295. 

reynu rajan, nik ritza kosai.  (2018).  history and progress of bariatric surgery in malaysia.  - obesity surgery.  . 

hui ying khoo, kelvin voon, keat how teoh, shyang yee lim, premnath nagalingam, mohamad aznan shuhaili, reynu rajan, mustafa mohammed taher, nik ritza kosai.  (2018).  esophageal cancer in malaysia: the need for early detection.  - disease of the esophagus.  . 

mustafa mohammed taher, nik ritza kosai, dayang nita abdul aziz, reynu rajan.  (2018).  surgical site infection after gastrointestinal surgery in high-income, middle-income and low-income countries: a prospective, international, multicentre cohort study.  - lancet infectious disease.  . 

gendeh hs, taher mm, kosai nr, bs gendeh, muhammad ramzisham ar, das s.  (2018).  early buried bumper syndrome: bump it before you get buried.  - surgical chronicles.  . 

antimicrobial stewardship committee hctm ukm.  (2018).  hctm ppukm surgical prophylaxis guide 2018.  - .  73. 

kavitha subramaniam, wah-yun low, peng-choong lau, kin-fah chin, karuthan chinna, nik ritza kosai, mustafa mohammed taher, and reynu rajan.  (2018).  eating behaviour predicts weight loss six months after bariatric surgery: a longitudinal study.  - nutrients.  1-13. 

alfizah hanafiah, muhammad hafiz, asif sukri, raja affendi raja ali, nik ritza kosai, mohamad aznan shuhaili, mustafa mohammed taher.  (2018).  immunophenotyping of gastric cancers and non-gastric cancers using cluster of differentiation (cd) antibody microarray.  - 8th regional conference on molecular medicine in conjunction with 4th national conference for cancer research.  . 

chik ian, razman jarmin, affirul ariffin, hairol othman, zamri zuhdi, azlanudin azman, nik ritza kosai nik.  (2018).  a less invasive method of reducing the incidence of post-endoscopic retrograde cholangiopancreatography pancreatitis: intravenous diclofenac sodium versus placebo.  - asian journal of pharmaceutical and clinical research.  140-144. 

zahra rashidbenam, mohd hafidzul jasman, reynu rajan, fatimah mohd nor, guan hee tan, eng hong goh, xeng inn fam, christopher chee kong ho, mohamad aznan shuhaili, nik ritza kosai, zulkifli md zainuddin, min hwei ng.  (2018).  hypoxic preconditioning of adipose-derived mesencymal stem cells upregulates expression of extracellular matrix proteins.  - regenerative research.  . 

dayang anita aa, gendeh hs, gendeh mk, kosai nr, mohd ramzisham ar, reynu r..  (2017).  the end of catheter dislodgement? three facile steps to secure a tunneled central venous catheter.  - medicine & health.  375-377. 

reynu r, neeraj k, kosai nr.  (2017).  single incision laparoscopic bariatric surgery:challenging the conventional.  - medicine and health.  143-149. 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohamed taher and isa mohamed rose.  (2017).  distribution of gastric adenocarcinoma subtypes in different ethnicities in kuala lumpur, malaysia.  - malaysian journal of pathology.  235-242. 

nik kosai , anitha haniffa, razman jarmin, srijit das, reynu rajan, hanafiah harunarashid.  (2017).  paget-schroetter syndrome in 52-year-old male:an interesting case report.  - journal of krishna institute of medical sciences university.  104-106. 

ngo choon woon, nik ritza kosai, razman jarmin, mohd aznan shuhaili, mustafa mohd taher , reynu rajan.  (2017).  double trouble: cocurrent sigmoid volvulus and gastric volvulus in alzheimer`s disease.  - online journal of health and allied sciences.  . 

tan han loong, ngiu chai soon, nik ritza kosai nik mahmood, jeevinesh naidu, rafiz abdul rani, nazefah abdul hamid, marjanu hikmah elias, isa mohamed rose, azmi tamil, norfilza m. mokhtar, raja affendi raja ali.  (2017).  serum pepsinogen and gastrin 17 as potential biomarkers for pre malignant lesions in the gastric corpus.  - biomedical reports.  460-468. 

nik ritza kosai nik mahmood.  (2017).  pembedahan bariatrik tangani diabetes.  - harian metro.  20. 

gendeh hs, imran fh, kosai nr, gendeh bs, ramzisham ar, kelly eg.  (2017).  left facial tumour. what is it?.  - medicine and health.  154-155. 

nik ritza kosai.  (2017).  3rd international conference on advances in medical science 2017.  - adenocarcinoma of the gastro-oesophageal junction : the rise of a silent killer.  . 

hanafiah harunarashid, farrah-hani imran,, nik ritza kosai.  (2017).  minor surgery at a glance.  - .  120. 

j h lai, ms aznan, r reynu, mm taher, h firdaus, nr kosai.  (2017).  non-umbilical metastasis of a pancreatic adenocarcinoma: case report and review of literature.  - surgical chronicles.  . 

nik ritza kosai bin nik mahmood.  (2017).  surgery for diabetes?.  - the star.  9. 

zainal adwin zainal abidin, nik ritza kosai, mustafa mohd taher, iman ghoneim, mohd aznan shuhaili, nur yasmin yaacob, reynu rajan.  (2017).  a randomised controlled trial comparing the use of omega-3 polyunsaturated fatty acid supplements versus very low calorie dietary restriction in obese malaysian patients awaiting bariatric surgery.  - annals of laparoscopic and endoscopic surgery.  1-7. 

nik ritza kosai nik mahmood.  (2017).  bariatric surgery : timing.  - liver update 2017.  . 

ng chong beng, nik ritza kosai, lim shyang yee, srijit das, subasri a, reynu rajan.  (2017).  perianal ulcer and diabetes insipidus : a rare presentation of langerhans cell histiocytosis in an adult male.  - online journal of health and allied science.  1-3. 

zar chi thent, chiranjib chakraborty, pasuk mahakkanukrauh, nik ritza kosai nik mahmood, reynu rajan and srijit das.  (2017).  the molecular concept of atheromatous plaques.  - current drug targets.  1250-1258. 

reynu r, kosai nr.  (2017).  innovations in obesity and metabolic surgery:boon or bane?.  - medicine & health.  1-3. 

muhammad adi syazni, hardip singh gendeh, nik ritza kosai, mohd ramzisham abdul rahman, balwant singh gendeh, normala basiron, farrah hani imran.  (2017).  follicular thyroid cancer with sternal metastasis-challenges and outcomes.  - medical journal of malaysia.  80-82. 

w. liew, y. y. wai, n. r. kosai, h. s. gendeh.  (2017).  tackers versus glue mesh fixation: an objective assessment of postoperative acute and chronic pain using inflammatory markers.  - hernia.  549-554. 

jagwani a.v., reynu r., bin affirul a.c., mustafa m.t., kosai n.r..  (2016).  resolution of acanthosis nigricans following curative gastric carcinoma resection.  - clinica terapeutica.  99-100. 

mohammed m hajhammad , reynu rajan, nik ritza kosai, badrulhisham bahadzor.  (2016).  transmesenteric small bowel herniation causing intestinal obstruction following laparoscopic transperitoneal nephrectomy.  - formosan journal of surgery.  161-164. 

hajhamad m, reynu r, nik ritza kosai, mustafa mt, othman h.  (2016).  successful conservative management of pancreatica-colonic fistula following videoscopis assisted retroperitoneal debridement of infected pancreatic necrosis.case report and review of literature..  - brunei darussalam journal of health.  108-113. 

n.r kosai , r reynu ,h.s gendeh, srijit das, m. lakdawala.  (2016).  concurrent mesh repair of a morgagni and umbilical hernia during a laparoscopic sleeve gastrectomy in a morbidly obese individual.  - journal of krishna institute of medical sciences university (jkimsu).  87-92. 

reynu r, zainal za, kosai nr.  (2016).  pre-operative methods to reduce liver volume:a randomised controlled trial comparing the use of omega-3polyunsaturated fatty acid supplements vs vlcd restriction in patients awaiting bariatric surgery.  - obesity surgery.  122-123. 

reynu r, hisham ahk, kosai nr.  (2016).  concurrent minimally invasive repair of ventral hernia during laparoscopic sleeve gastrectomy : a prospective study.  - obesity surgery (ifso).  251. 

reynu r, hilal z, kosai nr.  (2016).  early effect of bariatric surgery on serum renin-aldosterone, blood pressure and weight: a prospective study in obese malaysian population.  - obesity surgery (ifso).  282-283. 

shabbir a, bc tai, lakdawala m, huang ck, praveen raj p, sby jimmy, eng a, lomanto d, cheng ak, rao j, rajan r, delko t, kosai n, k kasama, kow l, wei-jei lee.  (2016).  influence of asian ethnicity on weight loss 3 years following laparoscopic sleeve gastrectomy.  - obesity surgery (ifso).  349. 

mohd firdaus ca, reynu r, kosai nr.  (2016).  the effect of crura reinforcement on gastro-oesophageal reflux disease score following laparoscopic sleeve gastrectomy; a randomised controlled trial.  - obesity surgery (ifso).  550-551. 

elsa jr, reynu r, kosai nr.  (2016).  the effect of laparoscopic bariatric surgery on serum fibrinogen level : a prospective study in obese malaysian population.  - obesity surgery (ifso).  552-553. 

m mohd sukri, a hanafiah, n nik mahmood, mmohamed taher, i mohamed rose, r mohamed.  (2016).  distribution of cd antigens in gastric adenocarcinoma cell line infected with different caga genotypes of helicobacter pylori strains.  - helicobacter.  115-116. 

hl tan, cs ngiu, nr kosai, j naidu, r abdul rani, mh elias, nm mokhtar, na hamid, ra raja ali.  (2016).  the application of serum biomarkers to detect pre-malignant lesions in gastric corpus.  - annual scientific congredd of the malaysian society of gastroenterology and hepatology.  . 

hardip singh gendeh, farrah hani imran, nik ritza kosai, balwant singh gendeh, ramzisham abdul rahman, endah kelly.  (2016).  left facial tumour. what is it?.  - medicine and health.  319. 

hardip singh gendeh, farrah hani imran, muhammad razif muhammad yunus, nik ritza kosai.  (2016).  a rare oro-maxillo-ocular facial cleft.  - journal of surgical academia.  55. 

mohd firdaus, hardip singh gendeh, nik ritza kosai, farrah hani imran, ramzisham abdul rahman.  (2016).  an innovative technique for surgical positioning in head and neck surgery.  - medicine and health.  101-104. 

nik ritza kosai, hardip singh gendeh, jing liang ho, yi rong chiew, mustafa mohamed taher, paul anthony sutton.  (2016).  laparoscopic totally transhiatal diverticulectomy of giant epiphrenic oesophageal diverticulum.  - eastern journal of medicine.  141-144. 

mohammed hamad, reynu rajan, nik kosai, paul suttol, srijit das, hanafiah harunarashid.  (2016).  retained fractured fragment of a central venous catheter: a minimally invasive approach to safe retrieval.  - ethiopian journal of health sciences.  85-88. 

a. bhangu, ......, nr kosai, m taher, r rajan.....globalsurg collaborative.  (2016).  mortality of emergency abdominal surgery in high-, middle- and low-income countries.  - british journal of surgery.  971-988. 

hardip singh gendeh, noor dina hashim, mohd razif mohammad yunus, balwant singh gendeh, nik ritza kosai.  (2016).  the sequelae of barium aspiration.  - anz journal of surgery.  . 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohamed taher and isa mohamed rose.  (2016).  surface antigen profiling of helicobacter pylori-infected and -uninfected gastric cancer cells using antibody microarray.  - helicobacter.  417-427. 

hardip singh gendeh, bmbs, avinesh singh bhar, mbbs, manvin kaur gendeh, mbchb, hayati yaakup, mmed, balwant singh gendeh, famm, nik ritza kosai, frcs, ramzisham abdul rahman, ms.  (2016).  caring for the dying in a developing country, how prepared are we?.  - medical journal of malaysia.  259-263. 

dharmaraj b., kosai n.r., gendeh h., ramzisham a.r., das s..  (2016).  a prospective cohort study on quality of life after endoscopic thoracic sympathectomy for primary hyperhidrosis.  - clinica terapeutica.  67-71. 

r reynu, nr kosai, a haniffa.  (2015).  predicting diabetes remission following laparoscopic bariatric surgery in morbid obesity: a malaysian experience.  - obesity surgery (ifso).  323-324. 

r reynu, nr kosai, mt mustafa, lakdawala ma.  (2015).  concurrent laparoscopic mesh repair of a morgagni hernia, umbilical hernia and sleeve gastrectomy in a morbidly obese individual.  - obesity surgery (ifso).  322-323. 

nik kosai, reynu rajan, srijit das.  (2015).  platelet changes in healthy male smokers.  - saudi medical journal.  1501. 

gendeh hs, kosai nr, belani lk, taher mm, reynu r, ramzisham ar.  (2015).  an abdominal mass: a case of jekyll and hyde?.  - medicine & health.  156-158. 

kosai nr, khan a, mustafa mt, zalizawati za, mohd firdaus ca, leong jh.  (2015).  a rare case of a gastro-peritoneal fistula following laparoscopic sleeve gastrectomy successfully treated with endoscopic stenting.  - medicine & health.  159-164. 

gendeh hs, kosai nr, belani lk, taher mm, reynu r, ramzisham ar.  (2015).  an abdominal mass: a case of jekyll and hyde.  - medicine & health.  156-158. 

shahril k, reynu r, kosai nr, bong jj , rozman z, yazmin y, mohd ramzisham ar.  (2015).  inferior vena cava tumour thrombectomy by novel endovascular approach.  - medicine & health.  151-155. 

reynu r, zairul ma, kosai nr, levin kb, das s.  (2015).  a rare presentation of caviar appendix in an amyand`s hernia.  - brunei international medical journal.  209-213. 

r reynu, nr kosai.  (2015).  predicting remission of type 2 diabetes mellitus following laparoscopic bariatric surgery in morbidly obese malaysians: a randomised controlled trial.  - 4th national & 1st mediterranean congress on surgery for morbid obesity and metabolic disorders.  . 

alfizah hanafiah, asif sukri, nik ritza kosai, mustafa mohamed taher, isa mohamed rose.  (2015).  distinct cd antigens expression in helicobacter pylori-infected and -uninfected gastric cancer patients.  - gut 2015: annual scientific congress of malaysian society of gastroenterology & hepatology.  . 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohamed taher, isa mohamed rose.  (2015).  cd antigen expression in helicobacter pylori-infected patients with chronic gastritis and gastric cancer.  - minggu penyelidikan perubatan & kesihatan ke-17.  . 

asif sukri, alfizah hanafiah, nik ritza kosai, mustafa mohamed taher, isa mohamed rose.  (2015).  distinct helicobacter pylori caga genotypes induced different immunopheotypic changes of cd antigens in gastric adenocarcinoma cell line.  - minggu penyelidikan perubatan & kesihatan ke-17.  . 

r rajan, lks christopher, nr kosai, l kesu balani, m mohammed taher, s das, pa sutton.  (2015).  improvement of pulmonary function following a structured exercise regime in obese population: a universuty hospital experience in malaysia.  - 46th world congress of surgery international society of surgery 40th rsct annual scientific congress.  . 

mm taher, nrk nik mahmood, aa wahidy, r rajan.  (2015).  stump appendicitis : diagnosis dilemma and technical challenge.  - 46th world congress of surgery international society of surgery 40th rsct annual scientific congress.  . 

nik kosai, reynu rajan, srijit das.  (2015).  knowledge and attitude of nursing personnel towards depression in general hospitals: the korean perspective.  - journal of korean medical science.  209-1210. 

kosai nr, levin kb, reynu r, taher mm, ali rar, palaniappan s.  (2015).  snapshot quiz 15/1 (small bowel adenocarcinoma in crohn`s disease).  - british journal of surgery.  4-15. 

christodoulidou m, kosai nr, rajan r, hassan s, das s, sutton pa, varghese j.  (2015).  does mesh augmentation of the hiatal repair with gore bio-aŽ improve symptomatic outcomes in laparoscopic fundoplication?.  - international medical journal of malaysia.  43-48. 

elsa r, reynu r, kosai n r, yugasaravanan k.  (2015).  laparoscopic transgasrtic enucleation of a peri-cardial gastrointestinal stomal tumour (gist).  - annual scientific meeting college of surgeons academy of medicine of malaysia.  . 

r reynu, n r kosai, m t mustafa, k w chan.  (2015).  breast-esophagus syndrome: esophageal metastasis from invasive ductal carcinoma of breast.  - annual scientific meeting college of surgeon academy of medicine of malaysia.  . 

n r kosai, h s gendeh, m t mustafa, r reynu.  (2015).  an innovative method of managing early buried bumper syndrome.  - annual scientific meeting college of surgeon, academy of medicine of malaysia.  . 

a haniffa, r reynu, n r kosai.  (2015).  comparison between laparoscopic sleeve gastrectomy and laparoscopic roux-en-y gastric bypass in predicting the remission of type 2 diabetes mellitus in morbidly obese population.  - annual scientific meeting college of surgeon,academy of medicine of malaysia.  . 

a t hizami, r reynu, n r kosai, m t mustafa, g tikfu.  (2015).  laparoscopic sleeve gastrectomy versus laparoscopic banded gastric plication: a combined university hospital experience.  - college of surgeon, academy of medicine of malaysia.  . 

nr kosai, r rajan, ej roslani, pa sutton, m mustafa, s das.  (2015).  laparoendoscopic transgastric enucleation of an awkwardly sited peri-cardial gastrointestinal stromal tumour (gist): a multi- modal approach.  - clinica terapeutica.  248-252. 

divya vanoh, suzana shahar, nik ritza kosai nik mahmood.  (2015).  association between nutrient adequacy and psychosocial factors with overall rate of weight loss after bariatric surgery.  - asia pacific journal of clinical nutrition.  610-619. 

nik ritza kosai nik mahmood.  (2015).  surgery and endoscopic therapy as the new treatment option for metabolic syndrome and diabetes: a paradigm shift.  - 2nd international conference on advances in medical science (icams).  . 

nr kosai, r reynu, at hizami, g tikfu.  (2015).  comparative study between laparoscopic sleeve gastrectomy and laparoscopic banded gastric plication in malaysia.  - obesity surgery (ifso).  324. 

n kosai, y yussra, p a sutton, h f shabbar, r razrim, t mustafa, a tamil, r reynu.  (2015).  the early outcomes of a randomized single blinded prospective study of laparoscopic inguinal hernia repair: tac fixation versus self adhesive mesh.  - 1st world conference on abdominal wall hernia surgery.  . 

nr kosai, h amin-tai, hs gendeh, s salleh, r reynu, mm taher, pa sutton, s das.  (2015).  pregnant and serve acute abdominal pain: a surgical diagnostic dilemma.  - la clinica terapeutica.  110-113. 

lks christopher, nr kosai, r reynu, kb levin, mm taher, pa sutton, n sukor, s das.  (2015).  effect of exercise on pulmonary function test in obese malaysian patients.  - la clinica terapeutica.  105-109. 

siow lr, naresh g, kosai n r, harrunarashid h, p a sutton, zainal aa.  (2015).  accuracy of handheld continous wave - doppler ultrasound in the assessment of varicose veins.  - journal of surgical academia.  16-28. 

nik ritza kosai.  (2015).  shifting the paradigm: from bariatric surgery to metabolic surgery.  - journal of surgical academia.  1-2. 

kosai n, gendeh h, norfaezan a, razman j, sutton p, das s.  (2015).  prolapsing gastric polyp causing intermittent gastric outlet obstruction.  - international surgery.  1148-1152. 

reynu r, kumar r, kosai n r, farizal f, shuhaili ma, razman j, shahizon amm.  (2014).  vein of galen malformation.  - medicine & health.  155-156. 

mm taher, nr kosai, gendeh hs.  (2014).  creative treatment of early buried bumper syndrome.  - annals of the royal college of surgeons.  621-622. 

h anitha, y f lam, p a sutton, n r kosai, srijit das.  (2014).  refeeding syndrome: the danger of feeding a starving man.  - clinica terapeutica.  165(4):. 

m abdikarim, s shahari, m a idris, h hanafiah, n r kosai, s das.  (2014).  misdiagnosed infected aneurysm presenting as pyrexia of unknown origin (puo).  - clinica terapeutica.  165(4):143-145. 

thu, y; barakatun nisak, m; chin, y; gee, t; rohana, a; nik, r.  (2014).  comparison study between bariatric surgery and conventional treatment on nutritional status and quality of life among morbidly obese malaysian patients.  - obesity reviews.  15(S2):135. 

nik ritza kosai, h. s. gendeh, m. noorharisman, paul anthony sutton, srijit das.  (2014).  a case of closed loop small bowel obstruction within a strangulated incisional hernia in association with an acute gastric volvulus.  - acta medica.  83-86. 

nik ritza kosai.  (2014).  bariatric surgery in asia and malaysia.  - agm & annual scientific meeting.  . 

hs gendeh, nr kosai, sa watson, r kumari.  (2014).  cancer stem cells and chemoresistance in breast, prostate and colon cancer.  - agm & annual scientific meeting.  . 

nr kosai, mm taher, kb levin, ct tang, yc lim.  (2014).  synchronous gastric carcinoma and pancreatic tumors.  - agm & annual scientific meeting.  . 

r jarmin, z zuhdi, a azman, y yusoff, ac ariffin, nrn kosai, h othman, r rahim.  (2014).  early experience of the lateral approach for laparoscopic splenic preserving distal pancreatectomy.  - hpb ( journal of internation hepato-pancreatico-biliary association).  642. 

r.f. jailani, n.r. kosai, n.y. yaacob, r. jarmin, p. sutton, h. harunarrashid, j. murie, s. das.  (2014).  transarterial angioembolization versus surgery after failed endoscopic therapy for non-variceal upper gastrointestinal bleeding.  - la clinica terapeutica.  243-247. 

jh soh, mustafa taher, nik ritza kosai.  (2014).  prevalence of cardiac dysfunction among morbidly obese and metabolic syndrome patients.  - agm & annual scientific meeting.  . 

reynu r, kosai nr, aznan m, taher mm.  (2014).  uncommon presentation of a common aesthetic procedure: late infection of a ruptured silicone breast implant.  - medicine and health.  85-88. 

razman jarmin, zamri zuhdi, hairol othman, yussra yusoff, affirul chairil ariffin, razrim rahim, azlanuddin azman, nik ritza nik kosai.  (2014).  the management of acute cholecystitis in pregnancy.  - hpb journal.  340. 

nr kosai, hs gendeh, mm taher, r reynu.  (2014).  a creative treatment to treating early buried bumper syndrome.  - msgh annual scientific congress & ecco educational workshop.  . 

kosai nr , reynu r, abdikarim m, jasman mh, taher mm, idris ma, harunarashid h.  (2014).  multiple acute aortic dissection in a young adult.  - medicine & health.  143-149. 

yin-ping wong, fazarina mohammed, nik ritza kosai, mustafa mohammed taher, nurismah md isa.  (2014).  a case of thyroid transcription factor-1 (ttf-1) positive primaryn euroendocrine carcinoma of oesophagus: a potential diagnostic caveat.  - malaysian journal of pathology.  86. 

nr kosai, hs gendeh, mm taher, pa sutton.  (2014).  laparoscopic totally transhiatal diverticulectomy of giant epiphrenic oesophageal diverticulum.  - agm & annual scientific meeting.  . 

nur afdzillah ar, gendeh h, zulkifli i, nik ritza kosai nm, sagap i.  (2014).  blatchford and rockall scores in predicting ugib severity in single tertiary centre, experience in 50 consecutive urgent ogds: a prospective observational study.  - agm & annual scientific meeting.  . 

sm rusli, mm taher, nr kosai.  (2014).  body mass index and obstructive sleep apnoea.  - agm & annual scientific meeting.  . 

arvind jagwani, nr kosai, mm taher.  (2014).  bariatric surgery on the outcome of hypertension.  - agm & annual scientific meeting.  . 

anitha h, kosai n.  (2014).  surgical treatment of type 2 diabetes mellitus.  - agm & annual scientific meeting.  . 

cp ooi, nik kosai nm, m taher, z suehazlyn, s norlela, m norlaila, aw norasyikin, mohammad arif, o ahmad marzuki, ar anilah, m azura dina, ws wan juani, k nor azmi.  (2013).  comparing bariatric surgery versus non-surgical treatments experience in universiti kebangsaan malaysia medical centre.  - the 17th afes congress.  . 

nm nik kosai, m taher, c p ooi, z suehazlyn, s norlela, s norlaila, aw norasyikin, o ahmad marzuki, s mohammad arif, m azura dina, ws wan juani, k nor azmi.  (2013).  outcome of bariatric surgery following failed conservative weight management: the universiti kebangsaan malaysia medical centre experience.  - the 17th afes congress.  . 

kosai nr.  (2013).  is bariatic surgery the cure for diabetes mellitus?.  - medicine and health.  52-54. 

ooi cp, suehazlyn z, nm nik kosai, m taher, aw norasyikin, s norlela, m norlaila, o ahmad marzuki, s mohammad arif, ar anilah, m azura dina, ws wan juani, k nor azmi.  (2013).  the multidisciplinary endocrine obesity clinic : the universiti kebangsaan malaysia medical centre experience with non-surgical weight loss management.  - the 17th asean federation of endocrine societies congress.  . 

y yussra, h f shaba, n kosai.  (2013).  early outcome on randomized single blinded prospective study of laparoscopic inguinal hernia repair : tac fixation versus self adhesive mesh.  - annual general meeting & annual scientific meeting.  . 

s. farag, p sutton, k. s. leow, n. r. kosai, j razman, h. hanafiah, s. das.  (2013).  persistent mullerian duct syndrome: an interesting case report.  - la clinica terapeutica.  164(4):323-326. 

yussra y, sutton pa, kosai nr, razman j, mishra rk, harunarashid h, das s.  (2013).  single incision laparoscopic surgery (sils) inguinal hernia repair - recent clinical experiences of this novel technique.  - clinica terapeutica.  425-428. 

rafidah rosli, nik ritza kosai.  (2013).  makanan masin rangsang serangan kanser esofagus.  - isihat.  . 

nur hasyimah othman, dr nik ritza kosai nik mahmood.  (2013).  mengapa sakit perut?.  - isihat.  . 

nik ritza kosai nik mahmood.  (2013).  are we ready for bariatric surgery in treating patients with nafld? the debate: proponent.  - 10th liver update 2013 international conference.  . 

nik ritza kosai nik mahmood.  (2013).  parietex progriptm self-fixating mesh in laparoscopic hernia repair.  - .  . 

nik ritza kosai nik mahmood.  (2013).  tingkatkan peluang untuk hidup.  - kompilasi majalah isihat & mingguan malaysia.  . 

m.y. mohd rizal, n.r. kosai, p.a. sutton, z. rozman, j. razman, h. harunarashid, s. das.  (2013).  arterial embolization of a bleeding gastric dieulafoy lesion : a case report.  - clinica terapeutica.  25-27. 

noorharisman, pa sutton, nr kosai.  (2012).  a case of closed loop small bowel obstruction within a strangulated insional hernia and an associated with an acute gastric volvulus.  - annual scientific meeting of the malaysian society of gastroenterology and hepatology.  . 

j evans, n kosai, m onwudike, h harunarashid, s das, s shahari.  (2012).  the clinical and cost effectiveness of three day limb compression with coban following surgery on varicose veins.  - international medical journal.  19(4):337-338. 

noorharisman, pa sutton, nik kosai, hanafiah harunarashid, srijit das, j razman.  (2012).  managing the challenges of crohn`s disease with a complex enterocutaneous fistula: an approach to reconstructive surgery.  - british journal of medical and health sciences.  1(1):89-98. 

my rizal, nr kosai, rozman, j razman, h hanafiah, srijit das.  (2012).  arterial embolization of a bleeding gastric dieulafoy lesion: a case report.  - annual scientific meeting of the malaysian sociaety of gastroenterology and hepatology 2012.  . 

fj ruhi, nr kosai, j razman.  (2012).  where is the portal vein?.  - msgh e-bulletin.  . 

noorharisman, pa sutton, nr kosai.  (2012).  managing the challenges of chron`s disease with complex enterocutaneous fistula: an approach to reconstructive surgery.  - annual scientific meeting of the malaysian society of gastroenterology and hepatology.  . 

razman jarmin, azlanuddin azman, razrim rahim, nik ritza kosai and srijit das.  (2012).  a rare case of intussusception associated with metastasize small cell carcinoma of lung.  - acta medica iranica.  50(11):782-784. 

noor hidayah shafiee, nik ritza kosai.  (2012).  bedah & buang perut: tingkatkan peluang untuk hidup.  - isihat.  . 

fj ruhi, y yazmin, r razrim, z rozman, j razman, mr dzulkhairi, nr kosai.  (2012).  a comparison of transarterial angioembolization versus surgery after failed endoscopic therapy for non variceal upper gastrointestinal bleeding.  - annual scientific meeting of the malaysian society of gastroenterology and hepatology.  . 

nor faezan ar, azlanudin a, razrim r, nr kosai.  (2011).  prolapse of gastric polyps causing intermittent, recurrent gastric outlet obstruction.  - annual scientific meeting of the malaysian society gastroenterology and hepatology.  . 

kosai nr, razrim r, varghese t.  (2011).  laparoscopic trans-abdominal pre-peritoneal (tapp) inguinal hernia repair using a novel self-adhesive mesh..  - college of surgeon annual scientific meeting.  . 

y yussra, nr kosai, r razrim, a azlan, j razman.  (2011).  early experience of the lateral approach for laparoscopic splenic preserving distal pancreatectomy.  - annual general meeting & annual scientific meeting.  .