1. Graduate student, Graduate School of Clinical Dental Science, The Catholic University of Korea, Korea.
2. Associate Professor, Department of Orthodontics, University of Ulsan, Asan Medical Center, Korea.
3. Associate Professor, Department of Orthodontics, Yonsei University College of Dentistry, Korea.
4. Professior, Department of Orthodontics, Ehwa Womans University Mokdong Hospital, Korea.
5. Assistant Professor, Department of Orthodontics, The Catholic University of Korea, St. Mary's Hospital, Korea.