1. From the Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia, PA (S.R.M., S.E.K.); Division of Cardiology, University of California, Los Angeles, CA (G.C.F.); Department of Neurology, University of Calgary, Calgary, AB, Canada (E.E.S.); Duke Clinical Research Center, Durham, NC (L.K., D.M.O.); and Department of Neurology, Massachusetts General Hospital, Boston, MA (L.H.S.).