1. Department of Otolaryngology–Head and Neck Surgery Kurume University School of Medicine Kurume Japan
2. Division of Respirology, Neurology, and Rheumatology, Department of Internal Medicine Kurume University School of Medicine Kurume Japan
3. Department of Diagnostic Pathology Kurume University Hospital Kurume Japan
4. Biostatistics Center Kurume University School of Medicine Kurume Japan
5. Department of Radiology Kurume University School of Medicine Kurume Japan