1. Department of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
2. Harvard-MIT Division of Health Sciences and Technology, Harvard Medical School, Boston, Massachusetts
3. Department of Cell Biology and Neuroscience, University of California, Riverside, California
4. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
5. Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, California