1. Division of Reconstructive Surgery for Oral and Maxillofacial Region, Department of Human Biology and Pathophysiology, School of Dentistry, Health Sciences University of Hokkaido, Tobetsu‑cho, Ishikari‑gun, Hokkaido 061‑0293, Japan
2. Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori 036‑8564, Japan
3. Pathology Informatics Team, RIKEN Center for Advanced Intelligence Project, Chuo‑ku, Tokyo 103‑0027, Japan