1. Department of Surgical Pathology Okinawa Kyodo Hospital Naha Japan
2. Department of Diagnostic Pathology Bantane HospitalFujita Health University Nagoya Japan
3. Department of Diagnostic Pathology Kurume University Hospital Kurume Japan
4. Division of Diagnostic Pathology Kyushu University Hospital Fukuoka Japan
5. Department of Pathology University of the Ryukyus Hospital Nishihara Japan
6. Department of Diagnostic Pathology Kyoto Medical Center Kyoto Japan
7. Department of Head and Neck Oncology and Surgery International University of Health and WelfareMita Hospital Tokyo Japan
8. Department of Surgical Pathology Ehime University Hospital Toon Japan
9. Department of Diagnostic Pathology Hiroshima Red Cross Hospital and Atomic‐Bomb Survivors Hospital Hiroshima Japan
10. Department of Diagnostic Pathology Kure Medical Center and Chugoku Cancer Center Kure Japan
11. Department of Diagnostic Pathology Kochi University Hospital Nangoku Japan
12. Department of Pathology Naritatomisato Tokushukai Hospital Tomisato Japan
13. Department of Anatomic Pathology Tokyo Medical University Tokyo Japan
14. Department of Pathology and Laboratory Medicine Nagoya University Hospital Nagoya Japan