1. Department of Otolaryngology Tenri Hospital Nara Japan
2. Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine Kyoto University Kyoto Japan
3. Department of Otolaryngology, Head and Neck Surgery Shizuoka City Shizuoka Hospital Shizuoka Japan
4. Department of Otolaryngology—Head and Neck Surgery, School of Medicine Fujita Health University Toyoake Aichi Japan