1. Faculty of Public Health, Chiang Mai University, Chiang Mai, Thailand
2. Departments of Internal Medicine and Anthropology, University of Michigan, Michigan, USA
3. College of Public Health Sciences Chulalongkorn University, Bangkok, Thailand
4. Faculty of Medicine, Prince of Songkla University, Songkla, Thailand
5. Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
6. Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
7. National Health Examination Survey Office, Bangkok, Thailand