1. Department of Otolaryngology and Head and Neck Surgery ; Kansai Rosai Hospital; Hyogo Japan
2. Department of Otolaryngology and Head and Neck Surgery; Osaka University, Graduate School of Medicine; Osaka Japan
3. Department of Otolaryngology and Head and Neck Surgery; Nara Medical University; Nara Japan
4. Department of Radiology; Nagoya University Graduate School of Medicine; Aichi Japan
5. Department of Otolaryngology; University of Tokushima School of Medicine; Tokushima Japan