1. Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, Arizona, USA
2. International Scholar, Graduate School of Dentistry, Kyung Hee University, Seoul, Korea
3. Predoctoral Student, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania, USA
4. Department of Orthodontics, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea