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. Biostatistics Center; Kurume University School of Medicine; Kurume Fukuoka Japan