1 Department of Epidemiology, Harvard School of Public Health, Boston, MA. 2 Department of Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA. 3 Department of Community Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand. 4 Department of Ambulatory Care and Prevention, Harvard Medical School and Harvard Pilgrim Health Care, Boston, MA. 5 De...
