1. Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA
2. Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky, USA
3. Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, Kentucky, USA
4. ICORD, University of British Columbia, GF Strong Rehabilitation Centre, Vancouver, Canada
5. National Institute of Neurological Disorders and Stroke, Bethesda, Maryland, USA
6. Craig H. Neilsen Foundation, Encino, California, USA