1. Department of Radiology, Medical Center University of Regensburg, Faculty of Medicine, University Hospital Regensburg, Germany
2. Department of Internal Medicine, Hospital Barmherzige Brüder, Regensburg, Germany
3. Department of Radiology, Medical Center University of Halle (Saale), Faculty of Medicine, University of Halle (Saale), Germany
4. Department of Diagnostic and Interventional Radiology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Germany