1. Department of Radiation Oncology; University of Tsukuba; Tsukuba Japan
2. Division of Proton Therapy; Shizuoka Cancer Center Hospital; Nagaizumi Shizuoka Japan
3. Division of Radiation Oncology and Particle Therapy; National Cancer Center Hospital East; Kashiwa Chiba Japan
4. Department of Radiology; Hyogo Ion Beam Medical Center; Tatsuno Hyogo Japan
5. Department of Child Health; University of Tsukuba; Tsukuba Japan
6. Division of Pediatrics; Shizuoka Cancer Center Hospital; Nagaizumi Shizuoka Japan
7. National Center for Child Health and Development; Tokyo Japan
8. Department of Radiation Oncology; Hokkaido University Hospital; Sapporo Japan