1. From the Department of Clinical Neurosciences (J.V.G., P.S.J., F.I.A., C.J.P., E.A.W., J.-C.B.), University of Cambridge, UK; the Stroke Unit (E.A.W.), Addenbrooke’s Hospital, Cambridge, UK; the Wolfson Brain Imaging Centre (T.D.F., O.B., F.I.A., T.A.C., J.H.G., J.-C.B.), University of Cambridge Clinical School, UK; the Department of Medicine (C.J.P.), University of Cambridge Clinical School, UK; and the Department of Radiology (J.H.G.), University of Cambridge Clinical School, UK.