1. Department of Pathology and Molecular Diagnostics Graduate School of Medical Sciences Nagoya City University Nagoya Japan
2. Department of Maxillofacial Surgery School of Dentistry Aichi‐Gakuin University Nagoya Japan
3. Department of Otolaryngology, Head and Neck Surgery Graduate School of Medical Sciences Nagoya City University Nagoya Japan
4. Department of Anatomic Pathology Tokyo Medical University Tokyo Japan
5. Department of Pathology Shizuoka General Hospital Shizuoka Japan
6. Department of Diagnostic Pathology School of Medicine Fujita Health University Toyoake Japan
7. Department of Anatomic Pathology Graduate of School of Medical Science Kyushu University Fukuoka Japan
8. Department of Otolaryngology‐Head and Neck Surgery Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Japan
9. Department of Otorhinolaryngology, Head and Neck Surgery Tokyo Medical University Tokyo Japan
10. Department of Otolaryngology‐Head and Neck Surgery Tokai University School of Medicine Isehara Japan
11. Department of Head and Neck Surgery Aichi Cancer Center Hospital Nagoya Japan
12. Department of Otolaryngology, Head and Neck Surgery Kansai Medical University Hirakata Japan
13. Department of Otorhinolaryngology‐Head and Neck Surgery Osaka Medical College Takatsuki Japan
14. Department of Head and Neck Oncology and Surgery International University of Health and WelfareMita Hospital Tokyo Japan
15. Department of Otolaryngology‐Head and Neck Surgery Kobe University Graduate School of Medicine Kobe Japan