1. Department of Internal Medicine III, University Hospital Ulm, Ulm, Germany
2. Division of Gastroenterology, Hepatology and Nutrition, Virginia Commonwealth University, Richmond, VA, USA
3. Department of Internal Medicine I, University Hospital Ulm, Ulm, Germany
4. Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Cleveland, Ohio, USA
5. Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany