1. Graduate School of Clinical Dental Science Catholic University of Korea Seoul Korea
2. Department of Orthodontics Section of Dentistry Seoul National University Bundang Hospital Seongnam Korea
3. Department of Orthodontics Seoul St. Mary’s Hospital College of Medicine Catholic University of Korea Seoul Korea
4. Postgraduate Orthodontic Program Arizona School of Dentistry & Oral Health, A.T. Still University Mesa, AZ and International Scholar Graduate School of Dentistry Kyung Hee University Seoul Korea