1. Department of Neurosurgery, Graduate School of Medicine, Yokohama City University , Yokohama , Japan
2. Laboratory of Biopharmaceutical and Regenerative Science, Graduate School of Medical Science, Yokohama City University , Yokohama , Japan
3. Department of Pathology, Kyorin University School of Medicine , Tokyo , Japan
4. Deparment of Brain Disease Translational Research, Juntendo University Faculty of Medicine , Tokyo , Japan
5. Department of Radiology, Yokohama City University Hospital , Yokohama , Japan
6. Department of Pathology, Yokohama City University Hospital , Yokohama , Japan