1. Associate Professor, Department of Orthodontics, College of Dentistry, Kyung Hee University, Seoul, Korea
2. Clinical Assistant Professor, Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea
3. Professor and Chairman, Department of Orthodontics, Graduate School of Clinical Dentistry, Ajou University, Suwon, Korea
4. Clinical Professor, Division of Orthodontics, The University of California San Francisco, San Francisco, Calif