1. Chonburi Medical Education Centre; Department of Social Medicine; Chonburi Hospital, Department of Social Medicine Sukhumvit Road Chonburi Thailand 20000
2. Institute of Metabolic Science; MRC Epidemiology Unit; Box 285, Addenbrooke's Hospital Cambridge Cambridgeshire UK CB2 0QQ
3. Ramathibodi Hospital, Mahidol University; Family Medicine; Rama VI Road, Rajthevee Bangkok Thailand 10400
4. Health Intervention and Technology Assessment Program (HITAP); Department of Health, Ministry of Public Health; Tiwanon Road Muang Nonthaburi Thailand 11000