1. The Miami Project to Cure Paralysis and the Department of Neurological Surgery, University of Miami School of Medicine, Miami, Florida.
2. International Center for Spinal Cord Injury, Kennedy Krieger Institute and the Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland.
3. Kentucky Spinal Cord Injury Research Center, Departments of Neurological Surgery and Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, Louisville, Kentucky.