1. Department of Diagnostic Pathology Kumamoto University Hospital Kumamoto Japan
2. Department of Anatomic Pathology Tokyo Medical University Tokyo Japan
3. Department of Otolaryngology‐Head and Neck Surgery Kumamoto University Kumamoto Japan
4. Department of Diagnostic Radiology, Graduate School of Life Sciences Kumamoto University Kumamoto Japan
5. Department of Medical Imaging Sciences, Faculty of Life Sciences Kumamoto University Kumamoto Japan
6. Department of Pathology and Laboratory Medicine Nagoya University Hospital, Aichi Japan