1. Department of Psychiatry, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
2. Department of Family Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
3. Research Institute for Health Sciences, Chiang Mai University, Chiang Mai, Thailand
4. Northern Substance Abuse Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
5. Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
6. Department of Community Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
7. Public Health Science College, Chulalongkorn University, Chiang Mai, Bangkok, Thailand
8. Social Research Institute, Chulalongkorn University, Bangkok, Thailand