1. Former graduate student, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea
2. Research Assistant Professor, Department of Orthodontics, The Catholic University of Korea, Seoul, Korea
3. Clinical Assistant Professor, Department of Periodontics, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
4. Associate Professor and Chair, Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, AT Still University, Mesa, Ariz, and Adjunct Professor, Graduate School of Dentistry, Kyung Hee University, Seoul, Korea
5. Professor, Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea
6. Professor, Department of Orthodontics, Seoul St Mary's Hospital, The Catholic University of Korea, Seoul, Korea