1. Department of Neurosurgery, Gifu University, Gifu, Japan
2. Department of Stem Cell Biology and Regenerative Medicine, Cleveland Clinic Foundation, Cleveland, OH, USA
3. Department of Neurosurgery, University of Louisville, Louisville, KY, USA
4. Division of Stem Cell Biology, Technische Universitat Dresden, Dresden, Germany
5. Neuro-Oncology Branch, National Cancer Institute, NIH, Bethesda, MD, USA