1. Division of Pediatric Dentistry, Department of Orthodontics and Pediatric Dentistry, Faculty of Dentistry Chiang Mai University Chiang Mai Thailand
2. Division of Community Dentistry, Department of Family and Community Dentistry, Faculty of Dentistry Chiang Mai University Chiang Mai Thailand
3. Department of Family Medicine and Center for Clinical Epidemiology and Clinical Statistics, Faculty of Medicine Chiang Mai University Chiang Mai Thailand