1. Department of Otolaryngology‐Head and Neck Surgery, Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Hokkaido Japan
2. Graduate School of Information Science and Technology Hokkaido University Sapporo Japan
3. Department of Forensic Medicine, Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Hokkaido Japan
4. Department of Surgery–Otorhinolaryngology Head and Neck Surgery Central Adelaide Local Health Network and the University of Adelaide Adelaide South Australia Australia
5. Department of Urology, Hokkaido University Graduate School of Medicine Hokkaido University Sapporo Hokkaido Japan