1. Gunma University Initiative for Advanced Research, Gunma University, Gunma, Japan
2. Department of Radiation Oncology and Winship Cancer Institute, Emory University School of Medicine, Atlanta, GA, USA
3. Gunma University Heavy Ion Medical Center, Gunma University, Gunma, Japan
4. Department of Life Sciences, Faculty of Science and Engineering, Kindai University, Osaka, Japan
5. Division of Molecular Oncological Pharmacy, Faculty of Pharmacy, Keio University, Tokyo, Japan
6. Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA