1. Department of Anesthesiology; University of California; San Diego La Jolla CA USA
2. Department of Neurosurgery; Aalborg University Hospital; Aalborg Denmark
3. Department of Biomedicine; Institute of Anatomy, University of Aarhus; Aarhus Denmark
4. Department of Neurosurgery; Aarhus University Hospital; Aarhus Denmark
5. MRC 312, McLean Hospital, Harvard Medical School; Belmont MA 02478 USA
6. UCSD Division of Neurosurgery; University of California; San Diego CA USA
7. Institute of Animal Physiology and Genetics, Czech Academy of Sciences; 277 21 Libechov Czech Republic
8. Neuralstem, Inc.; Rockville MD USA
9. Department of Cellular and Molecular Medicine; University of California; San Diego CA USA
10. Department of Pathology; University of California; San Diego CA USA
11. Institute of Neurobiology, Slovak Academy of Sciences; Kosice Slovakia