1. Unit of Biostatistics & Research Methodology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia; Faculty of Health Sciences, Asia Metropolitan University, Selangor Darul Ehsan, Malaysia
2. Institute for Community (Health) Development, Universiti Sultan Zainal Abidin, Kuala Nerus, Terengganu, Malaysia
3. Department of Psychiatry, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
4. Unit of Biostatistics & Research Methodology, Department of Psychiatry, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
5. Department of Neuroscience, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia