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