1. Department of Gastroenterology and Hepatology; University Hospital of Cologne; Cologne Germany
2. Institute of Pathology; University Hospital of Cologne; Cologne Germany
3. Department I of Internal Medicine; University Hospital of Cologne; Cologne Germany
4. German Center for Infection Research (DZIF), Partner Site Bonn-Cologne; Cologne Germany
5. Department of General, Visceral and Cancer Surgery; University Hospital of Cologne; Cologne Germany
6. Center for Molecular Medicine Cologne; University of Cologne; Cologne Germany