1. Medical University Department, Division of General Internal and Emergency Medicine, Cantonal Hospital Aarau, Aarau, Switzerland
2. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
3. Division of Gastroenterology, University Center for Gastrointestinal and Liver Diseases, St Clara Hospital and University Hospital, Basel, Switzerland
4. Division of Internal Medicine, University Hospital Basel, Basel, Switzerland
5. Faculty of Medicine, University of Basel, Basel, Switzerland
6. Department of Medicine, Cantonal Hospital Baden, Baden, Switzerland
7. Department of Medicine, Hospital Muri, Muri, Switzerland
8. Department of Medicine, Hospital Zofingen, Zofingen, Switzerland
9. Department of Medicine, Cantonal Hospital Muensterlingen, Muensterlingen, Switzerland
10. Department of Medicine, Hospital Interlaken, Hospitals Frutigen Meiringen Interlaken, Interlaken, Switzerland
11. Department of Medicine, Duke University and Duke-Margolis Center for Health Policy, Durham, North Carolina
12. Federal Statistical Office, Neuchâtel, Switzerland
13. National Institute for Cancer Epidemiology and Registration, National Agency for Cancer Registration, University of Zurich, Switzerland
14. Nursing Science, Department of Public Health of Basel, Switzerland