1. Department of Neuroradiology (J.-H.B., S.J., M.N.P., M.K.), University of Goettingen, D-37075 Goettingen, Germany
2. Department of Diagnostic and Interventional Radiology (J.-H.B.), University of Hamburg, D-20246 Hamburg, Germany
3. Department of Diagnostic and Interventional Radiology (S.G., M.F.), University of Essen, D-45147 Essen, Germany
4. Department of Neuroradiology (S.H., H.B.), University of Munich, D-81377 Munich, Germany
5. Departments of Neuroradiology (S.S.-H., A.D.), University of Erlangen-Nuremberg, D-91054 Erlangen Germany
6. Department of Neuroradiology (R.K.), Charité, Free University of Berlin, D-10117 Berlin, Germany
7. ClinSupport, Clinical Trials and Marketing Support (M.J.), Erlangen, Germany
8. Neurosurgery (M.B.), University of Erlangen-Nuremberg, D-91054 Erlangen Germany