1. Department of Internal Medicine II, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany;
2. Department of Surgery, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany;
3. Department of Paediatrics, Medical Faculty Mannheim, University of Heidelberg, Germany
4. Medical Faculty Mannheim, University of Heidelberg, Central Interdisciplinary Endoscopy, Germany;