Published on in Vol 5 , No 2 (2018) :Apr-Jun
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10308, first published
.

1 Department of Community Medicine, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
2 Unit of Biostatistics and Research Methodology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Malaysia