1. From the Unitat Neurovascular (M.R., A.F., M.R., J.P., D.R.-L., O.M., S.P., J.A.-S., C.A.M.), Neurologia and Neuroradiologia (P.C., F.J.R.), Hospital Universitari Vall d' Hebron, Universitat Autonoma de Barcelona, Barcelona, Spain; and Hospital Universitario Coimbra (J.S.-F.), Coimbra, Portugal.