1. Department of Otolaryngology – Head and Neck Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan;
2. Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan;
3. Department of Otolaryngology, Ehime University School of Medicine, Shigenobu-cho, Toon City, Ehime, Japan;
4. Department of Otorhinolaryngology, Saitama School of Medicine, Iruma-gun, Saitama, Japan;
5. Department of Otolaryngology, Hospital, National Rehabilitation Center for Persons with Disabilities, Tokorozawa City, Saitama Prefecture, Japan;
6. Division of Hearing and Balance Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Meguro-ku, Tokyo, Japan;
7. Department of Otorhinolaryngology, Hirosaki University Graduate School of Medicine, Bunkyo-cho, Hirosaki-shi, Japan;
8. Department of Otolaryngology, Gunma University Graduate School of Medicine, Maebashi-City, Japan;
9. Department of Otolaryngology, Kobe City Medical Center General Hospital, Chuo-ku, Kobe-City, Hyogo, Japan;
10. Department of Otolaryngology-Head and Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmacy, Okayama, Japan;
11. Department of Otorhinolaryngology Head and Neck Surgery, Keio University School of Medicine, Tokyo, Japan;
12. Department of Otolaryngology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan;
13. Department of Otorhinolaryngology, Iwate Medical University, Morioka, Iwate, Japan;
14. Department of Otorhinolaryngology, Nagoya University, Graduate School of Medicine, Showa-ku, Nagoya, Japan;
15. Department of Otorhinolaryngology, Head and Neck Surgery, Graduate School of Medicine, University of Ryukyu, Nishihara-cho, Nakagami-gun, Okinawa, Japan;
16. Department of Otolaryngology, Nagasaki University Faculty of Medicine, Nagasaki-shi, Nagasaki, Japan;
17. Department of Otolaryngology, Faculty of Medicine, University of Miyazaki, Miyazaki-shi, Miyazaki, Japan;
18. Department of Otolaryngology, Yamaguchi University Graduate School of Medicine, Ube City, Yamaguchi, Japan;
19. Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Tokyo, Japan