1. Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine The Catholic University of Kore Seoul Republic of Korea
2. Department of Periodontics, Seoul St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Republic of Korea
3. Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health A.T. Still University Mesa AZ USA
4. Graduate School of Dentistry Kyung Hee University Seoul Republic of Korea