1. Center for Stem Cell Therapeutics and Imaging, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA.
2. Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA.
3. Department of Neurosurgery, Keio University School of Medicine, Shinjuku-ku, Tokyo 160-8582, Japan.
4. Cancer Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
5. VA Boston Healthcare System, Brigham and Women’s Hospital, Harvard Medical School, West Roxbury, MA 02132, USA.
6. Harvard Stem Cell Institute, Harvard University, Cambridge, MA 02138, USA.