1. Department of Gastroenterology University Hospital Zurich (USZ) University of Zurich Zurich Switzerland
2. Center for Gastroenterology and Hepatology Zurich Switzerland
3. Institute of Social and Preventive Medicine University of Bern Bern Switzerland
4. Center of Gastroenterology Clinic Hirslanden Zurich Switzerland
5. Department of Visceral Surgery and Medicine Inselspital Bern Bern Switzerland
6. Division of Gastroenterology and Hepatology Centre Hospitalier Universitaire Vaudois (CHUV) University of Lausanne Lausanne Switzerland
7. Center for Primary Care and Public Health (Unisanté) University of Lausanne Lausanne Switzerland