1. Department of Gastroenterology and Hepatology, Faculty of Medicine, University Hospital Essen University of Duisburg‐Essen Essen Germany
2. Department of General‐, Visceral‐ and Transplantation Surgery, Faculty of Medicine, University Hospital Essen University of Duisburg‐Essen Essen Germany
3. Institute of Pathology, Faculty of Medicine, University Hospital Essen University of Duisburg‐Essen Essen Germany