1. Faculty of Pharmacy, University Malaya, Kuala Lumpur, Malaysia
2. University Malaya Centre for Addiction Science (UMCAS), Kuala Lumpur, Malaysia
3. Pharmaceutical Service Division, Ministry of Health, Petaling Jaya, Malaysia
4. Department of Psychiatry, Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Kuala Lumpur, Malaysia
5. Kuliyyah of Nursing, International Islamic University of Malaysia (IIUM), Kuantan, Pahang, Malaysia