1. Research Assistant, Department of Public Health, Graduate School of Public Health and Welfare, Jeju National University, Jeju, Republic of Korea
2. Professor, Department of Public Health, Graduate School of Public Health and Welfare, Jeju National University, Jeju, Republic of Korea
3. Associate Professor, Department of Dentistry, Eunpyeong St. Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
4. Assistant Professor , Department of Public Health, Graduate School of Public Health and Welfare, Jeju National University, Jeju, Republic of Korea
5. Assistant Professor, Department of Dentistry, School of Medicine, Jeju National University, Jeju, Republic of Korea
6. Professor, Department of Dentistry, School of Medicine, Jeju National University, Jeju, Republic of Korea