Aaron P Turner1, Kevin N Alschuler2. 1. VA Puget Sound Health Care System, Seattle, WA, USA; VA MS Center of Excellence-West, Seattle, WA, USA/Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA. 2. Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA/Department of Neurology, University of Washington, Seattle, WA, USA.