1. Graduate Student, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.
2. Resident, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.
3. Assistant Professor, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.
4. Professor, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.