1 Division of Hearing and Balance Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, 2‑5‑1 Higashigaoka, Meguro, Tokyo, 152‑8902, Japan. wasano@a5.keio.jp.
2 Department of Otolaryngology, National Hospital Organization Tokyo Medical Center, Tokyo, Japan. wasano@a5.keio.jp.
3 Department of Otolaryngology‑Head and Neck Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo, 160‑8582, Japan. oishin@keio.jp.
4 Department of Otolaryngology, Hino Municipal Hospital, Tokyo, Japan.
5 Department of Otolaryngology, National Hospital Organization Tokyo Medical Center, Tokyo, Japan.
6 Department of Otolaryngology, Saiseikai Utsunomiya Hospital, Tochigi, Japan.
7 Department of Otolaryngology‑Head and Neck Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo, 160‑8582, Japan.
8 Department of Otolaryngology, Hiratsuka City Hospital, Kanagawa, Japan.
9 Department of Otolaryngology, Japanese Red Cross Shizuoka Hospital, Shizuoka, Japan.
10 Department of Otolaryngology, Inagi Municipal Hospital, Tokyo, Japan.