1. Department of Oral & Maxillofacial Surgery, Chonnam National University School of Dentistry, Gwangju, Korea.
2. Department of Periodontology, Chonnam National University School of Dentistry, Gwangju, Korea.
3. Department of Orthodontics, Chonnam National University School of Dentistry, Gwangju, Korea.
4. Department of Preventive Medicine, Chonnam National University Medical School, Gwangju, Korea.
5. Department of Dental Education, Dental Science Research Institute, Chonnam National University School of Dentistry, Gwangju, Korea.