1. Private Practice, Seoul, Korea.
2. Department of Dentistry, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Postgraduate Studies, the Universidad Autonóma del Paraguay, Asunción, Paraguay.
4. School of Dentistry, University California San Francisco, San Francisco, CA, USA.
5. Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6. Division of Orthodontics, Department of Dentistry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.