1. Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul, Korea.
2. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Sana'a University, Sana'a, Yemen.
3. The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
4. Dental Research Institute, Seoul National University, Seoul, Korea.
5. Oral Cancer Center, Seoul National University Dental Hospital, Seoul, Korea.