1. Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea.
2. Department of Dentistry, 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. Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
7. Department of Oromaxilla-Radiology, School of Dentistry, Kyung Hee University, Seoul, Korea.
8. Department of Oral and Maxillofacial Surgery, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
9. Private Practice, Los Angeles, CA, USA.