Affiliation: | ∗ Proton Medical Research Center, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan;† Department of Neurosurgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan;‡ Department of Radiation Oncology, University Hospital of Tsukuba, Tsukuba, Ibaraki, Japan;§ Department of Radiology, Teikyo University School of Medicine, Kaga, Tokyo, Japan;¶ Department of Radiology, Tokyo Medical University, Shinjuku, Tokyo, Japan |