1. From the Department of Neurology, University of Virginia, Charlottesville, Va. (CLG, SAS, GFW, MJB); the School of Medicine, University of Virginia, Charlottesville, Va. (AP); the Department of Physical Therapy, University of Virginia, Charlottesville, Va. (DSH); and the Department of Neurosurgery, University of Virginia, Charlottesville, Va. (WJE).