1. From the Department of Neurology (A.G., S.J., M-L.M., U.F., O.F., A.W., N.M., G.M.D.M., H.P.M., M.A.), Inselspital, University Hospital Bern and University of Bern, Bern, Switzerland; and Department of Diagnostic and Interventional Neuroradiology (C.B., M.E-K., G.S., J.G.), Inselspital, University Hospital Bern and University of Bern, Bern, Switzerland.