1. Clinic of Oral Medicine and Orofacial Pain; Institute of Oral Health Science; Ajou University School of Medicine; Suwon Korea
2. Department of Epidemiology; School of Public Health; Seoul National University; Seoul Korea
3. Department of Family Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
4. Department of Orthodontics; Institute of Oral Health Science; Ajou University School of Medicine; Suwon Korea