1. Department of Diagnostic and Interventional Radiology, Helios Klinikum Krefeld, Krefeld, Germany
2. Faculty of Health, University Witten/Herdecke, School of Medicine, Witten, Germany
3. Department of Diagnostic and Interventional Radiology, Helios Klinikum Wuppertal, Wuppertal, Germany
4. Department of Cardiology, Heart Centre Niederrhein, Helios Clinic Krefeld, Krefeld, Germany
5. Department of Neurologie, University Hospital Bonn, Bonn, Germany