1. Department of Oral and Maxillofacial Surgery, Seoul Asan Medical Center, Seoul, Republic of Korea.
2. Department of Prosthodontics, Ewha Womans University, School of Medicine, Seoul, Republic of Korea.
3. Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital, Seoul, Republic of Korea.
4. Department of Prosthodontics, Seoul National University Dental Hospital, Seoul, Republic of Korea.