1. Department of Oral Medicine, Chosun University Dental Hospital, Gwangju, Korea
2. Department of Oral and Maxillofacial Radiology, School of Dentistry, Chosun University, Gwangju, Korea
3. Department of Orthodontics, School of Dentistry, Chosun University, Gwangju, Korea
4. Department of Oral Medicine, School of Dentistry, Chosun University, Gwangju, Korea