1. Department of Radiation Oncology, Gunma University Graduate School of Medicine, Maebashi, Japan;
2. Department of Radiation Oncology, Fukushima Medical University, Fukushima City, Japan;
3. National Institute of Radiological Sciences Hospital, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan;
4. Department of Radiation Oncology, Saitama Medical University, International Medical Center, Hidaka, Japan;
5. Department of Progressive DOHaD Research, Fukushima Medical University, Fukushima City, Japan;
6. Department of Gastrointestinal Tract Surgery, Fukushima Medical University, Fukushima City, Japan