1. Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea.
2. College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Postgraduate Studies, Universidad Autonóma del Paraguay, Asunción, Paraguay.
4. Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.
5. Graduate School of Dentistry, Kyung Hee University, Seoul, Korea.
6. Private Practice, Incheon, Korea.
7. Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, Korea.
8. Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.