1. Department of Oral & Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Oral & Maxillofacial Surgery, Seoul National University School of Dentistry, Seoul, Korea.
3. Department of Periodontology, Seoul National University School of Dentistry, Seoul, Korea.
4. R&D Institute, Korea Tooth Bank, Seoul, Korea.