1. From the Departments of Diagnostic and Interventional Neuroradiology (P.J.M., J.K., D.G., S.B., E.P., T.D., F.Z., P.M., M.E.K., R.W., F.W., J.G.), Bern University Hospital, Switzerland.
2. Neurology (S.B., L.P., M.A., S.J., A.G., U.F.), Bern University Hospital, Switzerland.
3. Neurosurgery (D.B.), Bern University Hospital, Switzerland.