1. From the Department of Diagnostic and Interventional Neuroradiology (P.P.G., M.E.-K., K.H., C.Z., G.S., J.G., S.J.) and Department of Neurology (S.v.A., M.-L.M., M.R.H., U.F., H.P.M., M.A., S.J.), Inselspital, University Hospital Bern, University of Bern, Bern, Switzerland.