Affiliations 1 University Institute for Diagnostic, Interventional and Pediatric Radiology, Inselspital – University Hospital Bern, Switzerland 2 Institute of Diagnostic and Interventional Radiology, University of Würzburg, Germany 3 Röntgeninstitut Düsseldorf, Düsseldorf, Germany 4 Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany