1. Department of Otorhinolaryngology, Tokai University School of Medicine, Tokai University Hachiouji Hospital
2. Department of Otorhinolaryngology, Tokai Voice Clinic Center, Tokai University School of Medicine, Tokai University Tokyo Hospital
3. Department of Otorhinolaryngology, Tokai University School of Medicinee
4. Department of Pathology, Tokai University School of Medicine, Tokai University Tokyo Hospital