1. Department of Diagnostic Pathology Kyoto University Hospital Kyoto Japan
2. Department of Diagnostic Pathology Kobe City Nishi‐Kobe Medical Center Hyogo Japan
3. Department of Diagnostic Pathology Tenri Hospital Nara Japan
4. Department of Otolaryngology—Head and Neck Surgery, School of Medicine Fujita Health University Aichi Japan
5. Department of Anatomic Pathology Tokyo Medical University Tokyo Japan