1. Department of Otolaryngology, Head and Neck SurgeryGraduate School of Medicine, Kyoto University Kyoto Japan
2. Department of Otolaryngology, Head and Neck SurgeryNational Hospital Organization Kyoto Medical Center Kyoto Japan
3. Department of Otolaryngology, Head and Neck SurgeryShizuoka City Shizuoka Hospital Shizuoka Japan
4. Shiga Medical Center Research Institute Moriyama Japan