1. Department of Biomedical Engineering, College of Medicine, Kyung Hee University, Seoul, Korea.
2. Department of Medical Engineering, Graduate School, Kyung Hee University, Seoul, Korea.
3. Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
4. Department of Orthodontics, School of Dentistry, Kyung Hee University, Seoul, Korea.