1. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
2. Institute of Medical Virology, University of Zurich, Zurich, Switzerland
3. Laboratory of Virology, Geneva University Hospitals, Geneva, Switzerland
4. Division of Immunology and Allergy, University Hospital Lausanne, Lausanne, Switzerland
5. Molecular Virology, Department of Biomedicine - Petersplatz, University of Basel, Basel, Switzerland
6. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
7. Division of Infectious Diseases, Regional Hospital Lugano, Lugano, Switzerland
8. Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
9. Service of Infectious Diseases, Department of Medicine, Lausanne University Hospital, Lausanne, Switzerland
10. Department of Infectious Diseases, Bern University Hospital, University of Bern, Bern, Switzerland
11. Division of Infectious Diseases, Cantonal Hospital St. Gallen, St. Gallen, Switzerland