Affiliation: | aDepartment of Neurosurgery, Graduate School of Comprehensive Human Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Japan;bDepartment of Radiation Oncology, Graduate School of Comprehensive Human Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Japan;cDepartment of Neurosurgery, Tokushima University, 2-50-1 Kuramoto, Tokushima, Japan |