1. Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea.
2. Private Practice, Seoul, Korea.
3. Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
4. Division of Orthodontics, Department of Dentistry, Asan Medical Center, Seoul, Korea.
5. Department of Orthodontics, Ewha Womans University Mokdong Hospital, Seoul, Korea.
6. Division of Orthodontics, Department of Dentistry, St. Paul's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.