1. University of Yamanashi Department of Radiology, , 1110 Shimokato, Chuo, Yamanashi 409-3898, Japan
2. Nara Medical University Hospital Department of Medical Informatics, , 840 Shijyo-cho, Kashihara, Nara 634-8521, Japan
3. Yamagata University Department of Radiation Oncology, Faculty of Medicine, , 2-2-2 Iida-Nishi, Yamagata, Yamagata 990-9585, Japan
4. Tohoku University Graduate School of Medicine Department of Radiation Oncology, , 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8574, Japan
5. Tokyo Bay Makuhari Clinic for Advanced Imaging, Cancer Screening, and High-Precision Radiotherapy Division of Medical Physics, , 1-17 Toyosuna, Mihama-ku, Chiba, Chiba 261-0024, Japan
6. Tokyo Women's Medical University Department of Radiation Oncology, , 8-1, Kawada-Cho, Shinjuku-Ku, Tokyo 162-8666, Japan