1. Department of Orthodontics, 2nd Stage of Brain Korea 21, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea.
2. Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea; Department of Stomatology, Bethune International Peace Hospital, Shijiazhuang, PR China.
3. School of Dentistry, Chonnam National University, Gwangju, Korea.
4. Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea.
5. Department of Oral and Maxillofacial Radiology, School of Dentistry, Chonnam National University, Gwangju, Korea.