1. Department of Radiation Oncology and Image-applied Therapy; Graduate School of Medicine, Kyoto University; Kyoto Japan
2. Division of Clinical Radiology Service; Kyoto University Hospital; Kyoto Japan
3. Department of Radiology; Kurashiki Central Hospital; Kurashiki Japan
4. Department of Radiation Oncology; Graduate School of Medicine, Yamaguchi University; Yamaguchi Japan