1. Radiation Therapy Section; Department of Clinical Support; Hiroshima University Hospital; Hiroshima Japan
2. Medical and Dental Sciences Course; Graduate School of Biomedical & Health Sciences; Hiroshima University; Hiroshima Japan
3. Department of Radiation Oncology; Institute of Biomedical & Health Sciences; Hiroshima University; Hiroshima Japan
4. Hiroshima High-Precision Radiotherapy Cancer Center; Hiroshima Japan
5. Department of Nuclear Engineering and Management; School of Engineering; University of Tokyo; Tokyo Japan
6. Tokyo Women's Medical University Graduate School of Medicine Medical Physics; Tokyo Japan