1. Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg
2. Department of Clinical Radiology, Klinikum der Universität München, Campus Großhadern, München, Germany
3. Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Germany
4. MEVIS, Fraunhofer, Bremen, Germany
5. Department of Diagnostic and Interventional Radiology and Neuroradiology, Univ. Duisburg-Essen, Medical Faculty, Essen, Germany
6. Department of Diagnostic Radiology and Neuroradiology, Ernst-Moritz-Arndt-University, Greifswald, Germany
7. Community Medicine, Universitätsklinikum Greifswald, Germany