1. From the Stroke Unit, Departments of Neurology (D.R.L., N.R.V., J.M.J., S.B., M.M, J.P., M. Rubiera, M. Ribo, C.A.M.) and Neuroradiology (P.C., A.T.), Vall d’Hebron University Hospital, Vall d’Hebron Research Institute, Autonomous University of Barcelona, Ps Vall d’Hebron 119, 08035 Barcelona, Spain; and Calgary Stroke Program, Department of Clinical Neurosciences and Radiology, Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada (A.M.D., M.G.).