1. Department of Oral and Maxillofacial Surgery, Asahi University Murakami Memorial Hospital, Gifu 500‑8523, Japan
2. Department of Neurosurgery, Asahi University Murakami Memorial Hospital, Gifu 500‑8523, Japan
3. Department of Pathology, Asahi University Murakami Memorial Hospital, Gifu 500‑8523, Japan
4. Department of Oral and Maxillofacial Surgery, Division of Oral Pathogenesis and Disease Control, Asahi University, School of Dentistry, Mizuho, Gifu 501‑0296, Japan