1. Department of Otorhinolaryngology, Nagoya City University West Medical Center
2. Department of Otolaryngology, Head and Neck Surgery, Nagoya city University Graduate School of Medical Sciences
3. Department of Otorhinolaryngology, Konan Kosei Hospital
4. Department of Otorhinolaryngology, Anjo Kosei Hospital
5. Department of Otorhinolaryngology, Japanese Red Cross Aichi Medical Center Nagoya Daini Hospital
6. Department of Otorhinolaryngology, Kainan Hospital
7. Department of Otorhinolaryngology, Toyota Kosei Hospital
8. Department of Otorhinolaryngology, Toyohashi Municipal Hospital
9. Department of Otorhinolaryngology, Ichinomiya Municipal Hospital