1. Department of Otolaryngology - Head and Neck Surgery; Kurume University School of Medicine; Kurume Fukuoka Japan
2. Division of Respirology, Neurology, and Rheumatology, Department of Internal Medicine; Kurume University School of Medicine; Kurume Fukuoka Japan
3. Department of Diagnostic Pathology; Kurume University Hospital; Kurume Fukuoka Japan
4. Cancer Vaccine Center; Kanagawa Cancer Center Research Institute; Yokohama Japan
5. Biostatistics Center; Kurume University School of Medicine; Kurume Fukuoka Japan
6. Department of Otolaryngology; Iizuka Hospital; Iizuka Fukuoka Japan
7. Department of Otolaryngology; Omuta City Hospital; Omuta Fukuoka Japan
8. Department of Radiology; Kurume University School of Medicine; Kurume Fukuoka Japan
9. Department of Otolaryngology; St. Mary's Hospital; Kurume Fukuoka Japan
10. Department of Otolaryngology; Yame General Hospital; Yame Fukuoka Japan