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