Affiliation: | 1. Department of Gastroenterology, Hepatology and Infectious Diseases, Otto‐von‐Guericke University of Magdeburg, , Magdeburg, Germany;2. Division of Gastroenterology, University of Alabama, , Birmingham, USA;3. Department of Dermatology and Venereology, Otto‐von‐Guericke University of Magdeburg, , Magdeburg, Germany |