Ela B Plow1, Michael G Fehlings. 1. From the Departments of Biomedical Engineering and Physical Medicine and Rehabilitation, and the Center for Neurological Restoration (E.B.P.), Cleveland Clinic, Cleveland, OH; the Department of Genetics and Development (M.G.F.), Toronto Western Research Institute, University Health Network; the Krembil Neuroscience Centre (M.G.F.), Spinal Program, Toronto Western Hospital, University Health Network; and the Department of Surgery (M.G.F.), Division of Neurosurgery and Spinal Program, University of Toronto, Canada.