1. Dental Public Health Department, Chiang Mai Provincial Public Health Office, Suthep Road , Chiang Mai 50200, Thailand
2. Health Services Policy and Management, Arnold School of Public Health, University of South Carolina, 915 Greene Street, Columbia , SC 29208, USA
3. National Health Commission Officer, (NHCO), National Health Building, 3rd Floor, 88/39, Tiwanon 14 Road , Nonthaburi 11000, Thailand