1. Department of Radiation Oncology, Graduate School of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo, 0608638, Japan
2. Faculty of Engineering, Hokkaido University, North-13, West-8, Kita-ku, Sapporo, 0608628, Japan
3. Global Station for Quantum Biomedical Science and Engineering, Global Institute for Cooperative Research and Education, Hokkaido University, North-15 West-7, Kita-ku, Sapporo, 0608638, Japan
4. Department of Radiation Oncology, University Medical Center Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
5. Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd, Houston, TX 77030, USA
6. Department of Radiation Oncology, Mayo Clinic, 200 1st St SW, Rochester, MN 55902, USA
7. Department of Radiation Oncology and Molecular Radiation Sciences, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, 733 N Broadway, Baltimore, MD 21205, USA
8. National Institute of Radiological Sciences, 4 Chome-9-1 Anagawa, Inage Ward, Chiba, 2630024, Japan
9. Department of Radiation Oncology, Stanford University, 291 Campus Drive, Stanford, CA 94305, USA
10. Graduate School of Information Science and Technology, Hokkaido University, North-14 West-9, Kita-ku, Sapporo, 0600814, Japan
11. Department of Radiation Oncology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
12. Faculty of Health Sciences, Hokkaido University, North-12 West-5, Kita-ku, Sapporo, 060-0812, Japan
13. Department of Medical Statistics, Kobe Pharmaceutical University, 4-19-1, Motoyamakitamachi, Higashinada-ku, Kobe-shi, Hyogo, 658-8558, Japan
14. Department of Biostatistics, Faculty of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo, 0608638, Japan
15. Department of Medical Physics, Faculty of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo, 0608638, Japan
16. Department of Radiation Oncology, Faculty of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo, 0608638, Japan
17. Department of Radiation Medicine, Faculty of Medicine, Hokkaido University, North-15 West-7, Kita-ku, Sapporo, 0608638, Japan