1. Graduate Student, Department of Orthodontics, School of Dentistry, Chonnam National University, Korea.
2. Assistant Professor, Department of Oral Medicine, School of Dentistry, Chonnam National University, Korea.
3. Associate Professor, Department of Orthodontics, School of Dentistry, Chonnam National University, Korea.
4. Professor, Department of Orthodontics, 2nd Stage of Brain Korea 21, School of Dentistry, Dental Science Research Institute, Chonnam National University, Korea.