1. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich
2. Swiss National Center for Retroviruses, Institute of Medical Virology, University of Zurich
3. Laboratory of Virology, Geneva University Hospital
4. Division of Immunology and Allergy, University Hospital Lausanne
5. Department of Biomedicine–Petersplatz, University of Basel
6. Faculty of Biology and Medicine, University of Lausanne
7. Department of Infectious Diseases, Bern University Hospital and University of Berne
8. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel
9. Infectious Diseases Department, Geneva University Hospital
10. Division of Infectious Diseases, University Hospital Lausanne
11. Division of Infectious Diseases, Regional Hospital Lugano
12. Division of Infectious Diseases, Cantonal Hospital St Gallen, Switzerland