1. Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, International University of Health and Welfare, Narita Hospital
2. Department of Otorhinolaryngology-Head and Neck Surgery, Hiroshima City Hiroshima Citizens Hospital
3. Department of Pathology, School of Medicine, International University of Health and Welfare, Narita Hospital
4. Department of Radiology, School of Medicine, International University of Health and Welfare, Narita Hospital