1. Department of Otolaryngology–Head and Neck Surgery, Graduate School of Medicine Kyoto University Kyoto Japan
2. Department of Radiation Oncology and Image‐Applied Therapy, Graduate School of Medicine Kyoto University Kyoto Japan
3. Department of Surgery, Graduate School of Medicine Kyoto University Kyoto Japan
4. Department of Therapeutic Oncology, Graduate School of Medicine Kyoto University Kyoto Japan