1. Dept. of Oral and Maxillofacial Surgery, Dunsan E-comfortable Dental Clinic, Daejeon, Korea
2. Dept. of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea
3. Dept. of Implantology, Mijo Dental Clinic, Namhae, Korea
4. Dept. of Dentistry, Seoul National University, Seoul, Korea