1. Department of Otolaryngology‑Head and Neck Surgery, Kyorin University School of Medicine, Tokyo 181‑8611, Japan
2. Department of Head and Neck Surgery, Aichi Cancer Center Hospital, Nagoya, Aichi 464‑8681, Japan
3. Department of Otolaryngology‑Head and Neck Surgery, Saitama Medical University International Medical Center, Saitama 350‑1298, Japan
4. Department of Otolaryngology‑Head and Neck Surgery, National Defence Medical College, Tokorozawa, Saitama 359‑8513, Japan
5. Department of Pathological Diagnosis, Nagoya Medical Center, Nagoya, Aichi 460‑0001, Japan
6. Department of Otolaryngology‑Head and Neck Surgery, Juntendo University School of Medicine, Tokyo 113‑8341, Japan