1. Department of Hepatology and Gastroenterology, Charité - Universitätsmedizin Berlin, Campus Mitte, Berlin, Germany
2. Department of Inflammation and Immunity, Lerner Research Institute, Department of Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, Ohio
3. University Medical Center Hamburg-Eppendorf, Hamburg, Germany
4. DRK Kliniken Berlin, Schwerpunkt Gastroenterologie, Berlin, Germany