1. Division of Oral and Maxillofacial Surgery, Department of Dentistry, College of Medicine, Hanyang University, Seoul, Korea
2. Department of Oral and Maxillofacial Surgery, Woori General Hospital, Pocheon, Korea
3. Department of Oral and Maxillofacial Surgery, The 22nd Century Seoul Dental Hospital, Incheon, Korea
4. Department of Medicine, Surgery, and Pharmacy, University of Sassari, Sassari, Italy