1. Department of Oral and Maxillofacial Functional Rehabilitation, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan
2. Department of Oral and Maxillofacial Surgery, University Hospital of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan
3. Department of Pathology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan
4. Division of Endocrinology, Diabetes and Metabolism, Hematology, Rheumatology (Second Department of Internal Medicine), Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan
5. Department of Endoscopy, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan
6. Department of Pathology and Cell Biology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan