1. Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
2. Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
3. Department of Orthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea.
4. Department and Research Institute of Dental Biomaterials and Bioengineering, College of Dentistry, Yonsei University, Seoul, Korea.