Affiliation: | 1. Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, South Korea 2. Department of Orthodontics, Biomedical Research Institute, Pusan National University Hospital, Gudeokro 137, Seogu, Busan, 626-739, South Korea 3. Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan 4. Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, USA 5. Dental clinic, Pusan National University Hospital, Busan, South Korea
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