1. Department of Neurosurgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba
2. Department of Pathology, Institute of Basic Medical Sciences, University of Tsukuba
3. Department of Neurosurgery, Tsukuba Central Hospital
4. Advanced Research Institute for Science and Engineering, Waseda University
5. Proton Medical Research Center, Graduate School of Comprehensive Human Sciences, University of Tsukuba