1. Department of NeurosurgeryFaculty of MedicineUniversity of Tsukuba Tsukuba Japan
2. Division of Brain Tumor Translational ResearchNational Cancer Center Research Institute Tokyo Japan
3. Department of PathologyGunma University Hospital Maebashi Japan
4. Department of Diagnostic PathologyNational Cancer Center Hospital Tokyo Japan
5. Division of Genome BiologyNational Cancer Center Research Institute Tokyo Japan
6. Department of PathologyNational Center for Child Health and Development Tokyo Japan
7. Department of NeurosurgeryYokohama City University Yokohama Japan