1. Department of Diagnostic and Interventional Radiology, Hospital Konstanz, Konstanz, Germany;
2. Department of Diagnostic and Interventional Radiology, Sana Clinic Hof, Hof, Germany;
3. Radiologie Weinheim, Weinheim, Germany;
4. Department of Diagnostic and Interventional Radiology, Radiologie Schwetzingen, Schwetzingen, Germany;
5. Department of Internal Medicine, Gastroenterology, Infectious Disease, Toxicology, University Hospital of Heidelberg, Heidelberg, Germany