- Corresponding author: Mohd Nazri Shafei, Department of Community Medicine, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, 16150 Kota Bharu, Kelantan, Malaysia, Tel.: +60-9-7676646, Fax: +60-9-7676654, E-mail:
- Received May 2, 2018
- Accepted August 9, 2018
- First published December 1, 2018.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.