1. Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine Nippon Medical School Tokyo Japan
2. Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine Chiba University Chiba Japan
3. Clinical Research Center Chiba University Hospital Chiba Japan
4. Department of Otorhinolaryngology International University of Health and Welfare Chiba Japan
5. Department of Medical Affairs Torii Pharmaceutical Co., Ltd Tokyo Japan
6. Chiba Rousai Hospital Chiba Japan