1. Department of Otorhinolaryngology and Head and neck surgery, Nagoya City University Graduate School of Medical Sciences
2. Department of Otorhinolaryngology, Konan Kosei Hospital
3. Department of Otorhinolaryngology, Toyota Kosei Hospital
4. Department of Head and neck surgery, Aichi Cancer Center
5. Department of Otorhinolaryngology, Nagoya City East Medical Center