1. Department of Health Policy and Administration, College of Public Health, University of the Philippines Manila, Manila, Philippines
2. Department of Applied Social Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
3. College of Public Health, University of the Philippines Manila, Manila, Philippines
4. Department of Health Promotion and Education, College of Public Health, University of the Philippines Manila, Manila, Philippines
5. Department of Medical Microbiology, College of Public Health, University of the Philippines Manila, Manila, Philippines
6. Institute of Herbal Medicine, National Institutes of Health, University of the Philippines Manila, Manila, Philippines
7. Don Jose Monfort Medical Center Extension Hospital, Iloilo, Philippines
8. Dangerous Drugs Abuse Prevention and Treatment Program, Department of Health, Manila, Philippines
9. National Center for Mental Health, Mandaluyong City, Philippines
10. Department of Psychiatry and Behavioral Medicine, College of Medicine and Philippine General Hospital, University of the Philippines Manila, Manila, Philippines
11. Group for Addiction Psychiatry of the Philippines, Pasig City, Philippines