1. Department of Radiology and Nuclear Medicine, University Hospital Schleswig-Holstein, Lübeck, Germany
2. Department for Diagnostic and Interventional Radiology, HELIOS Hospital Krefeld, Germany
3. Diagnostic & Interventional Radiology, Philipps-University Marburg, Germany
4. Zentralinstitut für bildgebende Diagnostik, Städtisches Klinikum Karlsruhe, Germany
5. Department of Diagnostic and Interventional Radiology, DRK Hospital Berlin, Germany
6. Institute and Policlinic for Diagnostic and Interventional Radiology, University Hospital, Carl-Gustav-Carus Technical University Dresden, Dresden, Germany
7. Department of Interventional Radiology, University Hospital rechts der Isar, München, Germany
8. Department of Radiology and Neuroradiology, Klinikum Dortmund gGmbH, Dortmund, Germany
9. Department of Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
10. Institute for Diagnostic and Interventional Radiology, Medical Faculty Heinrich Heine University Düsseldorf, Duesseldorf, Germany
11. Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
12. Department of Radiology, University of Wisconsin-Madison, United States
13. Department of Diagnostic and Interventional Radiology, Eberhard Karls University, Tuebingen University Hospital, Tubingen, Germany
14. Department of Diagnostic and Interventional Radiology, Goethe University Frankfurt, Frankfurt am Main, Germany
15. Institute of Clinical Radiology, University Hospital Munster, Germany
16. Neuroradiology, University Hospital Freiburg, Germany
17. Department of Radiology, Charite Medical Faculty Berlin, Germany