1. Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
3. Department of Prosthodontics, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Oral and Maxillofacial Surgery, School of Dentistry, Chosun University, Gwangju, Korea.