1. From the Department of Neurology (M.I., G.C., W.Y., R.A.S., J.C.), University of Pittsburgh School of Medicine, Pittsburgh, Pa; the Department of Neurological Surgery (J.L.), University of California–San Francisco, San Francisco, Calif; and the Geriatric Research, Education and Clinical Center (R.A.S., J.C.), Veterans Affairs Pittsburgh Health Care System, Pittsburgh, Pa.