1. Department of Gastroenterology & Hepatology, University Hospital Zurich, Zurich, Switzerland
2. Department of Infectious Diseases & Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
3. Department of Public & Global Health, University of Zurich, Zurich, Switzerland
4. Crohn and Colitis Center, Gastroentérologie Beaulieu SA, Lausanne, Switzerland
5. Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
6. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kantonsspital Sankt Gallen, St. Gallen, Switzerland
7. Department of Gastroenterology and Hepatology, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
8. Center of Gastroenterology and Hepatology, Zurich, Switzerland
9. Gastroenterology, Clinic for Visceral Surgery and Medicine, Inselspital, University Hospital of Bern, Bern, Switzerland