1 Department of Medicine II, Clinic for Gastroenterology, Hepatology, Endocrinology and Infectious Diseases, University Hospital Freiburg, Freiburg, Germany.
2 Department of Medicine II, Clinic for Gastroenterology, Hepatology, Endocrinology and Infectious Diseases, University Hospital Freiburg, Freiburg, Germany. robert.thimme@uniklinik-freiburg.de.