1. Department of Intensive Care Medicine; University Medical Center, Hamburg-Eppendorf; Hamburg Germany
2. Department of Internal Medicine III; Medical University of Vienna; Vienna Austria
3. Department of General Internal Medicine; University Hospitals Leuven; Leuven Belgium
4. Department of Internal Medicine I; University Medical Center Hamburg-Eppendorf; Hamburg Germany
5. Department of Medicine B, Gastroenterology and Hepatology; University Münster; Münster Germany