1. Health Research Group, Department of Statistics, University of Rajshahi, Rajshahi-6205, Bangladesh
2. Population Services and Training Center (PSTC), Bangladesh, E-mail: <>
3. Research Management Centre (RMC), Faculty of Medicine, University of Malaya, Malaysia, E-mail: <>
4. National Orthopaedic Centre of Excellence for Research and Learning (NOCERAL), Department of Orthopaedic Surgery, University of Malaya, Malaysia, E-mail: <>
5. Sections of Orthodontics and Oral Biology, School of Dentistry, University of California, USA, E-mail: <>
6. Centre for Poverty and Development Studies (CPDS), Faculty of Economics and Administration, University of Malaya, E-mail: <>
7. Faculty of Pharmacy, Lincoln University College, Malaysia, E-mail: <>