1. Department of Dentistry and Oral Surgery; Shinshu University School of Medicine; Matsumoto, Nagano Japan
2. Department of Oral and Maxillofacial Surgery; School of Medicine; Nara Medical University; Kashihara, Nara Japan
3. Department of Oral and Maxillofacial Surgery; Keiyukai Sapporo Hospital; Sapporo, Hokkaido Japan
4. Department of Oral and Maxillofacial Surgery; Division of Surgery; Tokai University School of Medicine; Isehara, Kanagawa Japan
5. First Department of Oral and Maxillofacial Surgery; Graduate School of Dentistry; Osaka University; Suita, Osaka Japan
6. Department of Clinical Oral Oncology; Nagasaki University Graduate School of Biomedical Sciences; Sakamoto, Nagasaki Japan