firdaus che ani, guo hou loo, richelle huey bing chua, kok-yong chin, nik ritza kosai.  (2025).  integrating cruroplasty with laparoscopic sleeve gastrectomy: a strategy to mitigate gerd symptoms in obese patients. a randomized control trial.  - langenbeck's archives of surgery.  1 - 7. 

wan izzah wan jaffar, guo hou loo, fazarina mohammed, deborah chia hsin chew, guhan muthkumaran and nik ritza kosai.  (2025).  case report: rare case of signet ring gastric adenocarcinoma with rectal metastasis.  - frontiers in oncology.  1 - 6. 

theeran kaur gill, guo hou loo, guhan muthkumaran, nik ritza kosai.  (2025).  posterior membranous tracheal injury during mckeown oesophagectomy. a case report with literature review..  - frontiers in oncology.  1 - 6. 

amrit manik nasta, ramen goel, rishi singhal, luc lemmens, sarfaraz baig, yosuke seki, arun prasad, sonja chiappetta, mohammad kermansaravi, marc vertruyen, beniamino pascotto, juan santiago azagra, waleed al-khyatt, gennaro martines, diva y villao, leandro revello, marco rioseco, francesco martini, arnaud liagre, gildas juglard, giovanni dapri, monika a proczko-stepaniak, adel k abou-mrad, hosam m elghadban, christine stier, jasper l van herck, safwan abdulrahman taha, ozan sen, bruno dillemans, stijn van hoef, mathieu vandeputte, sofie viskens, paolo gentileschi, raj palaniappan, nasser sakran, thomas h shin, ali aminian, matteo uccelli, stefano olmi, giovanni c cesana, marco anselmino, nicolas p a debergh, daniel gärtner, wah yang, digvijay s bedi, kamal mahawar, haidar abdalah, hytham hamid, rajesh gianchandani-moorjani, vincenzo bottino, alfonso bosco, errichetta napolitano, ravikrishna mamidanna, brij madhok, débora acín-gándara, manuel medina-garcía, sajith kumar, rajneesh bankenahally, yasmin sarfaraz, heather fry, tom wiggins, krishnamohan yarlagadda, anna popp, tadeja pintar, francesk mulita, georgios-ioannis verras, michail vailas, george skroubis, manish khaitan, giovanni lezoche, urs pfefferkorn, shahab shahabi, amir davarpanah, cunchuan wang, zhiyong dong, amador garcia ruiz de gordejuela, ramón vilallonga, Óscar gonzález, piotr major, piotr zarzycki, justyna rymarowicz, yannick nijs, jaydeep palep, randeep wadhawan, deepa kizhakke veetil, carlos esquivel, manuel garcía, fernando martinez lascano, maría muriel, josé foscarini, fajer nassour, kazunori kasama, agustin duro, sang hyun kim, aatif inam, sharad sharma, radwan kassir, manuel aceves avalos, saeed alsareii, miljana vladimirov, michela campanelli, domenico benavoli, emanuela bianciardi, juan carlos sebastián-tomás, ramón trullenque-juan, josé Ángel díez-ares, octávio viveiros, rui ribeiro, muzaffer al, ahmet gökhan, nikhilesh krishna, bassel haj, ramy gfely, jabra arraf, abdallah omari, ali awad, pranoy gupt, jacques himpens, jonathan super, vasileios charalampakis, markos daskalakis, mohamed sahloul, spyridon kapoulas, arab rawashdeh, kareem sillah, govindan raghuraman, ana garcia navarro, nr kosai, mohd firdaus che ani.  (2024).  30-day morbidity and mortality of revisional bariatric surgery – an international multi-centre collaborative (broad) study.  - obesity research & clinical practice.  195 - 200. 

nik ritza kosai, aishath azna ali, ryan ghita, guhan muthkumaran, ismail ali, guo hou loo, firdaus hayati.  (2024).  one-year outcomes in a supervised program of swallowable intragastric balloon—analysis of 486 patients in a high-volume bariatric centre in malaysia.  - obesity surgery.  3366 - 3371. 

asif sukri, alfizah hanafiah, nik ritza kossai, mohamad aznan shuhaili, mustafa mohammed taher, raja affendi raja ali.  (2024).  perbandingan pengekspresan antigen kluster pembezaan dalam subjenis tumor dan darah periferi pesakit kanser gaster .  - sains malaysiana.  3253 - 3262. 

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. 

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. 

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. 

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. 

muhamad zulhilmi akmal zainuddin, jemaima che hamzah, nik ritza kosai nik mahmood, cheng teck chee, mae-lynn catherine bastion.  (2025).  nutritional optic neuropathy: bariatric surgery gone wrong.  - cureus.  1 - 12. 

solomon raj vasudayan, guo hou loo, mogaraj sellapan, geok chin tan, nik ritza kosai.  (2025).  small bowel volvulus secondary to meckel’s diverticulum with meso-diverticular band: a case report and literature review.  - cureus.  1 - 5. 

mardiana mardan, wei keat ooi, arif hameed sultan, guo hou loo, nik ritza kosai.  (2025).  delayed strangulated hiatal hernia post-gastrectomy masquerading as diaphragmatic hernia: a diagnostic pitfall.  - cureus .  1 - 9. 

theeran kaur gill, guo hou loo, guhan muthkumaran, nik ritza kosai.  (2025).  posterior membranous tracheal injury during mckeown oesophagectomy. a case report with literature review..  - frontiers in oncology.  1 - 6. 

solomon raj vasudayan, guo hou loo, guhan muthkumaran, nik ritza kosai .  (2025).  gastric perforation secondary to a hyperinflated intragastric balloon: a case report and management approach.  - cureus.  1 - 7. 

hanafiah harunarashid, farrah-hani imran,, nik ritza kosai.  (2017).  chapter 17: skin incisions.  - at a glance series (oxford, england).  38-39. 

halina md. noor, nik ritza kosai nik mahmood.  (2025).  rawatan obesiti tanpa pembedahan, parut.  - utusan malaysia.  . 

nik ritza kosai nik mahmood.  (2025).  bariatrik bukan jalan pintas untuk cantik.  - sinar harian.  . 

nik ritza kosai nik mahmood.  (2025).  kaedah belon bantu atasi masalah obesiti.  - berita harian.  . 

nik ritza kosai nik mahmood.  (2025).  belon telan allurion jadi pilihan.  - harian metro.  . 

asif sukri, alfizah hanafiah, nik ritza kossai, mohamad aznan shuhaili, mustafa mohammed taher, raja affendi raja ali.  (2024).  perbandingan pengekspresan antigen kluster pembezaan dalam subjenis tumor dan darah periferi pesakit kanser gaster .  - sains malaysiana.  3253 - 3262. 

halina md. noor, nik ritza kosai nik mahmood.  (2025).  rawatan obesiti tanpa pembedahan, parut.  - utusan malaysia.  . 

nik ritza kosai nik mahmood.  (2025).  bariatrik bukan jalan pintas untuk cantik.  - sinar harian.  . 

nik ritza kosai nik mahmood, kok wei hao, lee chong chearn, azmi baharudin, deborah chew chia hsin, nor azmin aziz, norlela sukor.  (2025).  hctm pioneers endoscopic sleeve gastroplasty in fight against obesity.  - malaysiakini.  . 

nik ritza kosai nik mahmood.  (2025).  kaedah belon bantu atasi masalah obesiti.  - berita harian.  . 

rafe'aton md. ali, nik ritza kosai nik mahmood, loo guo hou.  (2025).  allurion ballon: a medical innovation to treat obesity without surgery.  - fokus bernama.  .