Stephen P Burns1,2, Keith E Tansey3,4,5. 1. Spinal Cord Injury Service, VA Puget Sound Health Care System, Seattle, WA, USA. spburns@uw.edu. 2. Department of Rehabilitation Medicine, University of Washington School of Medicine, Seattle, WA, USA. spburns@uw.edu. 3. Departments of Neurosurgery and Neurobiology, University of Mississippi Medical Center, Jackson, MS, USA. 4. Center for Neuroscience and Neurological Recovery, Methodist Rehabilitation Center, Jackson, MS, USA. 5. Spinal Cord Injury Clinic, Jackson VA Medical Center, Jackson, MS, USA.