1. Division of Oral Pathology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951‑8514, Japan
2. Oral Pathology Section, Department of Surgical Pathology, Niigata University Hospital, Niigata 951‑8520, Japan
3. Division of Molecular and Diagnostic Pathology, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951‑8122, Japan
4. Division of Oral and Maxillofacial Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951‑8514, Japan