1. Division of Gastroenterology and Hepatology, University Hospital Zürich, Zürich, Switzerland
2. Epidemiology, Biostatistics and Prevention Institute, Department of Biostatistics, University of Zürich, Zürich, Switzerland
3. Department of Pathology and Molecular Pathology, University Hospital Zürich, Zürich, Switzerland
4. Division of Gastroenterology and Hepatology, Stadtspital Zürich, Zürich, Switzerland
5. Gastroenterology and Hepatology Unit, Luzerner Kantonsspital, Lucerne, Switzerland