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shamsul azhar shah, nazarudin safian, saharuddin ahmad, wan abdul hannan wan ibadullah, zulkefley bin mohammad , siti rohani nurumal, juliana mansor, mohd fairuz addnan and yugo shobugawa.  (2021).  factors associated with happiness among malaysian elderly.  - international journal of environmental research and public health.  1-11. 

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sharifah saffinas syed soffian, nazarudin safian, azmawati mohammed nawi, shahrul bariyah ahmad, huan-keat chan, muhammad radzi abu hassan.  (2021).  rate and associated factors of refusal to perform immunochemical faecal occult blood test (ifobt) among semi-urban communities.  - plos one.  1-11. 

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