1. Department of Orthodontics, Kyung Hee University Dental Hospital, Seoul, Korea
2. Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
3. Private Practice, Seoul, Korea
4. Department of Oral & Maxillofacial Surgery, Kyung Hee University School of Dentistry, Seoul, Korea
5. Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul, Korea