1. Faculty of Medicine, Department of Family Medicine; Chiang Mai University; Chiang Mai Thailand
2. Faculty of Medicine, Department of Psychiatry; Chiang Mai University; Chiang Mai Thailand
3. Research Institute for Health Sciences; Chiang Mai University; Chiang Mai Thailand
4. Faculty of Medicine, Department of Community Medicine; Khon Kaen University; Khon Kaen Thailand
5. College of Public Health Sciences; Chulalongkorn University; Bangkok Thailand
6. Faculty of Medicine, Epidemiology Unit; Prince of Songkla University; Hat Yai Thailand