1. Resident, Department of Orthodontics, College of Dentistry, Yonsei University, Korea.
2. Associate Professor, Department of Orthodontics, College of Dentistry, The Institute of Cranio-facial Deformity, Yonsei University, Korea.
3. Professor, Department of Orthodontics, College of Dentistry, The Institute of Cranio-facial Deformity, Yonsei University, Korea.