1. Clinical Fellow, Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul, South Korea.
2. Professor and Chairman, Department of Orthodontics, School of Medicine, Ajou University, Suwon, Korea.
3. Associate Professor and Chairman, Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul, Korea.
4. Clinical Professor and Chair, Division of Orthodontics, Department of Orofacial Science, University of California San Francisco, San Francisco, Calif.