1. Department of Otolaryngology—Head & Neck Surgery Medical Research Institute KITANO HOSPITAL Osaka Japan
2. Department of Otolaryngology—Head & Neck Surgery Graduate School of Medicine, Kyoto University Kyoto Japan
3. Department of Otolaryngology—Head & Neck Surgery Kobe City Medical Center General Hospital Hyogo Japan
4. Department of Otolaryngology—Head & Neck Surgery National Hospital Organization Kyoto Medical Center Kyoto Japan
5. Department of Otolaryngology—Head & Neck Surgery Kurashiki Central Hospital Okayama Japan
6. Katsuragawa Mizuta ENT Clinic Kyoto Japan
7. Department of Otolaryngology Tenri Hospital Nara Japan
8. Department of Otolaryngology—Head and Neck Surgery, School of Medicine Fujita Health University Aichi Japan
9. Department of Otorhinolaryngology—Head and Neck Surgery University of Occupational and Environmental Health Kitakyushu Japan
10. Department of Otolaryngology Japanese Red Cross Wakayama Medical Center Wakayama Japan
11. Department of Otolaryngology Head and Neck Surgery, Japanese Red Cross Otsu Hospital Shiga Japan
12. Department of Otolaryngology—Head & Neck Surgery Hyogo Prefectural Amagasaki General Medical Center Hyogo Japan
13. Department of Otolaryngology—Head & Neck Surgery Kokura Memorial Hospital Fukuoka Japan
14. Department of Otorhinolaryngology—Head & Neck surgery Shizuoka General Hospital Shizuoka Japan
15. Department of Otorhinolaryngology—Head & Neck surgery Shiga General Hospital Shiga Japan
16. Department of Head and Neck Surgery Kanazawa Medical University Ishikawa Japan