1. Department for Internal Medicine I (Gastroenterology, Pulmonology), University Hospital Halle (Saale), Halle, Germany
2. Department for Diagnostic and Interventional Radiology, University Hospital Halle (Saale), Halle, Germany
3. Department of Diagnostic and Interventional Neuroradiology, University Hospital Augsburg, Augsburg, Germany
4. Department of Visceral, Vascular and Endocrine Surgery, University Hospital Halle (Saale), Halle, Germany