1. From the University Institute of Diagnostic and Interventional Neuroradiology (J.K., F.Z., P.J.M., T.D., E.P., M.E.-K., P.M., J.G.)
2. Department of Neurology (J.K., M.G., S.B., M.A., S.J., U.F.), University Hospital Bern, University of Bern, Inselspital, Switzerland.