1. Department of Otorhinolaryngology—Head and Neck Surgery Osaka University Graduate School of Medicine Osaka Japan
2. Department of Nuclear Medicine and Tracer Kinetics Osaka University Graduate School of Medicine Osaka Japan
3. Department of Radiology Osaka University Graduate School of Medicine Osaka Japan
4. Department of Biomedical Statistics Osaka University Graduate School of Medicine Osaka Japan
5. Department of Radiation Oncology Osaka University Graduate School of Medicine Osaka Japan