1. Department of Otorhinolaryngology/Head & Neck Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan
2. Department of Otorhinolaryngology, Shizuoka Saiseikai General Hospital, Shizuoka, Japan
3. Department of Otorhinolaryngology, Numazu City Hospital, Numazu, Japan
4. Department of Tumor Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan
5. Yamahoshi ENT Clinic, Hamamatsu, Japan