1. Department of Orthodontics, School of Dentistry, Pusan National University, Gyeongnam, Yangsan, Korea.
2. Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Gyeongnam, Yangsan, Korea.
3. Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Gyeongnam, Yangsan, Korea.