1. Department of Gastroenterology, Vivantes Hospital Friedrichshain Berlin, Berlin, Germany
2. Department of Medicine II, Medical Center – University of Freiburg, Faculty of Medicine, Freiburg, Germany
3. Department of Gastroenterology, Sana Hospital Offenbach, Offenbach, Germany
4. Department of Gastroenterology and Oncology, Ludwigsburg Hospital, Ludwigsburg, Germany
5. Department of Gastroenterology, University Hospital Augsburg, Augsburg, Germany
6. Department of Gastroenterology, Chemnitz Hospital, Chemnitz, Germany
7. Department of Gastroenterology, Robert Bosch Hospital, Stuttgart, Germany
8. Department of Internal Medicine and Gastroenterology, Evangelical Hospital Duesseldorf, Duesseldorf, Germany
9. Division of Gastroenterology, Triemli Hospital, Zurich, Switzerland
10. Department of Gastroenterology, Hospital Altenburger Land, Altenburg, Germany
11. Department of Gastroenterology, Hospital Garmisch-Partenkirchen, Garmisch-Partenkirchen, Germany
12. Interventional and Experimental Endoscopy (InExEn), Internal Medicine II, University Hospital Wuerzburg, Wuerzburg, Germany