1. Department of Infectious Diseases Bern University Hospital University of Bern Bern Switzerland
2. Department of Infectious Diseases University Hospital Lausanne Lausanne Switzerland
3. Department of Infectious Diseases University Hospital Geneva Geneva Switzerland
4. Department of Infectious Diseases University Hospital Zurich University of Zurich Zurich Switzerland
5. Department of Infectious Diseases University Hospital Basel and University of Basel Basel Switzerland
6. Department of Infectious Diseases Cantonal Hospital St. Gallen Switzerland
7. Department of Infectious Diseases Regional Hospital Lugano Switzerland
8. Department of Infectious Diseases Cantonal Hospital Aargau Aargau Switzerland
9. Department of Infectious Diseases Kantonsspital Baselland and University of Basel Basel Switzerland
10. Institute of Medical Virology University of Zurich Zurich Switzerland
11. Institute of Social and Preventive Medicine University of Bern Bern Switzerland