1. Martin Luther University of Halle-Wittenberg, Department of Internal Medicine I, Halle, Germany
2. Department of Gastroenterology, Hepatology and Infectious Diseases, University Hospital, Magdeburg, Germany
3. University Hospital Dresden, Department of Internal Medicine I, TU Dresden, Germany
4. Jena University Hospital, Department of Internal Medicine IV, Jena, Germany
5. Internistische Gemeinschaftspraxis für Verdauungs-und Stoffwechselkrankheiten Leipzig und Schkeuditz, Leipzig, Germany