1. Department of Otorhinolaryngology, Head and Neck Surgery, Faculty of Medicine, Academic Assembly, University of Toyama, Toyama, Japan
2. Department of Otorhinolaryngology, Toyama Red Cross Hospital, Toyama, Japan
3. Department of Otolaryngology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
4. Department of Otolaryngology, Tokyo Medical University, Tokyo, Japan
5. Department of Otolaryngology, Graduate School of Medicine, Gifu University, Gifu, Japan
6. Department of Otorhinolaryngology, Faculty of Medicine, Kindai University, Osaka, Japan
7. Department of Otorhinolaryngology, Saitama Medical University, Saitama, Japan
8. Department of Otorhinolaryngology Head and Neck Surgery, Graduate School of Medicine, Kobe University, Kobe, Japan
9. Department of Otolaryngology-Head and Neck Surgery, Nara Medical University, Nara, Japan
10. Department of Otolaryngology, St. Marianna University School of Medicine, Kawasaki, Japan
11. Department of Otolaryngology, Teikyo University School of Medicine, Mizonokuchi Hospital, Kawasaki, Japan
12. Department of Otolaryngology, School of Medicine, Kitasato University, Kanagawa, Japan
13. Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
14. Department of Otolaryngology-Head & Neck Surgery, Graduate School of Medicine, Gunma University, Maebashi, Japan
15. Department of Otorhinolaryngology, Head and Neck Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
16. Department of Hearing Implant Sciences, Shinshu University School of Medicine, Matsumoto, Japan
17. Department of Otolaryngology, Yamaguchi University Graduate School of Medicine, Ube, Japan