1. Department of Oral Medicine, School of Dentistry, Chosun University, Gwangju, Korea
2. Department of Oral and Maxillofacial Radiology, School of Dentistry, Chosun University, Gwangju, Korea
3. Department of Dentistry, Graduate School, Chosun University, Gwangju, Korea
4. Department of Oral Anatomy, School of Dentistry, Chosun University, Gwangju, Korea