1. Faculty of Social Sciences, Chiang Mai University, Chiang Mai, Thailand.
2. Research Institute for Health Sciences, Chiang Mai University, Thailand.
3. Faculty of Social Sciences, Chiang Mai University, Thailand.
4. Department of Global Health, Australian National University, Canberra, ACT, Australia.
5. National Centre for Epidemiology & Population Health, Australian National University, Canberra, ACT, Australia.
6. Faculty of Medicine, Chiang Mai University, Thailand.