1. Department of Gastroenterology and Hepatology; Charité Medical School; Humboldt-University of Berlin; Berlin Germany
2. Gastroenterology Practice; Minden Germany
3. Biostatistics Consulting; Münster Germany
4. Department of Internal Medicine IV (Gastroenterology, Hepatology and Infectious Diseases); University Hospital Jena; Jena Germany
5. Department Internal Medicine I; University Hospital Schleswig-Holstein Campus; Kiel University of Schleswig-Holstein; Kiel Germany