1. Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Dental Research Institute, Seoul National University School of Dentistry, Seoul, Korea.
3. Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Oral and Maxillofacial Surgery, Section of Dentistry, Gachon University Gil Medical Center, Incheon, Korea.
5. Department of Conservative Dentistry, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.