1. Department of Radiation Oncology, Graduate School of Medicine, Mie University, 2–174 Edobashi, Tsu, Mie 514-8507, Japan
2. Department of Radiation Oncology, Mie University Hospital, 2–174 Edobashi, Tsu, Mie 514-8507, Japan
3. Department of Radiology, Matsusaka Central Hospital, 102 Kobou Kawai-machi, Matsusaka, Mie, 515-8566, Japan
4. Department of Radiology, Graduate School of Medicine, Mie University, 2–174 Edobashi, Tsu, Mie 514-8507, Japan