1. Postgraduate Student, Department of Orthodontics, College of Dentistry, Kyunghee University, Korea.
2. Professor, Department of Orthodontics, College of Dentistry, Kyunghee University, Korea.
3. Assistant Professor, Department of Orthodontics, College of Dentistry, Kyunghee University, Korea.
4. Full-time Lecturer, Department of Orthodontics, College of Dentistry, Kyunghee University, Korea.