1. Department of Radiation Oncology Tohoku University Graduate School of Medicine Sendai Japan
2. Department of Radiology Toho University Omori Medical Center Tokyo Japan
3. Department of Public Health Kurume University School of Medicine Kurume Japan
4. Department of Radiation Oncology Hirosaki University Hirosaki Japan
5. Department of Radiology Yamanashi University Chuo Japan
6. Department of Radiation Oncology Seirei Mikatahara General Hospital Hamamatsu Japan
7. Department of Radiation Oncology and Image‐Applied Therapy, Graduate School of Medicine Kyoto University Kyoto Japan
8. Department of Radiology University of Tokyo Tokyo Japan
9. Department of Radiation Oncology Fukuyama City Hospital Fukuyama Japan
10. Department of Radiation Oncology Miyakojima IGRT Clinic Osaka Japan