1. The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
2. Department of Clinical Oral Oncology, Hokkaido Cancer Center, Sapporo, Japan
3. Department of Clinical Oral Oncology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
4. Department of Oral and Maxillofacial Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
5. Department of Oral and Maxillofacial Surgery, School of Medicine, Nara Medical University, Nara, Japan
6. Department of Dentistry and Oral Surgery, Shinshu University School of Medicine, Matsumoto, Japan
7. Oral and Maxillofacial Surgery, Oita Red Cross Hospital, Oita, Japan
8. Oral and Maxillofacial Surgery, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
9. Oral and Maxillofacial Surgery, Saiseikai Matsusaka General Hospital, Matsusaka, Japan