1. From the Department of Neurology (M.S.V.E.), Sergievsky Center (M.S.V.E., B.B.-A.), and Department of Medicine (R.S., S.H., M.R. Di T.), College of Physicians and Surgeons, and Division of Sociomedical Sciences, Joseph P. Mailman School of Public Health (B.B.-A.), Columbia University, and the Columbia-Presbyterian Medical Center of New York Presbyterian Hospital (M.S.V.E., R.S., S.H., M.R. Di T.), New York.