1. Department of Gastroenterology, Hepatology and Infectious Diseases, Otto-von-Guericke University, 39120 Magdeburg, Germany
2. Department of Gastroenterology and Institute for Digestive Research, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania
3. Medical Department II, University Hospital, Ludwig-Maximilians-Universität, 80539 Munich, Germany