1. Department of Oral and Maxillofacial Surgery, Faculty of Life Sciences, Kumamoto University, Kumamoto 860‑8556, Japan
2. Section of Oral Oncology, Department of Oral and Maxillofacial Surgery, Fukuoka Dental College, Fukuoka 814‑0193, Japan
3. Itoh Dento‑Maxillofacial Hospital, Kumamoto 860‑0851, Japan