1. Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of Vienna, Vienna, Austria
2. Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Medical University of Vienna, Vienna, Austria
3. Main Association of the Austrian Social Insurance Institutions, Vienna, Austria
4. Austrian Society of Gastroenterology and Hepatology (OEGGH) Quality assurance Working Group, Vienna, Austria