1. Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Austria
2. 1st Department of Internal Medicine with Gastroenterology, Hietzing Hospital, Vienna, Austria
3. Department of Internal Medicine, Barmherzige Brueder Hospital, St. Veit on the Glan, Austria
4. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Medical University of Graz, Austria
5. Division of Angiology, Department of Internal Medicine, Medical University of Graz, Austria