1. Department of Periodontics, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Dental Implantology, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea.
3. Department of Oral and Maxillofacial Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Division of Oral and Maxillofacial Surgery, Department of Dentistry, Uijeongbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Uijeongbu, Korea.
5. The Faculty of Liberal Arts, Eulji University, Seongnam, Korea.