1. Faculty of Medicine, Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
2. Faculty of Medicine, Clinical Research Center, Geneva University Hospitals, Geneva, Switzerland
3. Division of Infectious Diseases and Hospital Epidemiology, Cantonal Hospital St Gallen, St Gallen, Switzerland
4. Infectious Diseases Service, University Hospital, University of Lausanne, Lausanne, Switzerland
5. Faculty of Medicine, Division of Internal Medicine of the Aged, Geneva University Hospitals, Geneva, Switzerland
6. Division of Clinical Epidemiology, Department of Health and Community Medicine, Geneva University Hospitals, Geneva, Switzerland
7. Department of Internal Medicine, Geneva University Hospitals, Geneva, Switzerland