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