1. From the Department of Medicine (N.E.H., L.B.G., E.D.P., D.M.O., J.W.W., D.T.L.), Division of Neurology (N.E.H., L.B.G., D.M.O., D.T.L.), and Duke Clinical Research Institute (E.D.P., X.Z., W.P., D.M.O., L.O.Z., D.T.L.), Duke University Medical Center, Durham, NC; Durham Veterans Affairs (L.B.G., J.W.W.), Durham, NC; and the Department of Neurology (C.B.), Wake Forest University Health Sciences, Winston-Salem, NC.