1. Department of Otolaryngology, Japanese Red Cross Society Himeji Hospital, Himeji City, Hyogo, Japan
2. Department of Internal Medicine, Japanese Red Cross Society Himeji Hospital, Himeji City, Hyogo, Japan
3. Department of Pathology and Inspection Technology, Japanese Red Cross Society Himeji Hospital, Himeji City, Hyogo, Japan
4. Department of Otolaryngology–Head and Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama City, Okayama, Japan
5. Department of Otolaryngology–Head and Neck Surgery, Kumamoto University Graduate School of Medicine, Kumamoto City, Kumamoto, Japan
6. Department of Molecular Hematopathology, Okayama University Graduate School of Health Sciences, Okayama City, Okayama, Japan