1. Clinical Assistant Professor, Department of Prosthodontics, Yeouido St. Mary's Hospital, The Catholic University of Korea, Korea.
2. Private Practice, Korea.
3. Associate Professor, Department of Orthodontics, Yeouido St. Mary's Hospital, The Catholic University of Korea, Korea.
4. Assistant Professor, Department of Orthodontics, School of Dentistry, Kyung Hee University, Korea.
5. Professor, Department of Orthodontics, School of Clinical Dental Scinece, Ajou University, Korea.
6. Clinical Professor, Department of Orofacial Science, University of California in San Francisco, USA.
7. Clinical Assistant Professor, Department of Orthodontics, St. Vincent Hospital, The Catholic University of Korea, Korea.