From the Center for Genomic Medicine (K.C., C.G.-F., C.K., S.M., N.V., J.R.), Division of Neurocritical Care and Emergency Neurology, Department of Neurology (J.R.), and J. Philip Kistler Stroke Research Center (J.R.), Massachusetts General Hospital, Boston; Program in Medical and Population Genetics, Broad Institute, Cambridge, MA (K.C., C.G.-F., C.K., S.M., J.F., N.B., M.v.G., B.A., M.C., N.V., J.R., G.J.F.); Division of Neurocritical Care and Emergency Neurology, Department of Neurology, Yale University School of Medicine, New Haven, CT (L.M., G.J.F.); Institute for Stroke and Dementia Research, Klinikum der Universität München, Ludwig-Maximilian University, Munich, Germany (R.M.); Institute for Precision Cardiovascular Medicine, American Heart Association National Center, Dallas, TX (J.L.H.); Department of Medicine, Lillehei Heart Institute, University of Minnesota, Minneapolis (J.L.H.); and McMaster University, Hamilton, Ontario, Canada (M.C.).