1. From the Neuroimaging Research Unit (M.A.R., A.C., P.T., M.F.), CERMAC (M.A.R., A.F., G.S., M.F.), Department of Neuroradiology (A.F., G.S.), and Department of Neurology (B.C., L.B., G.C., M.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy.