1. Department of Infectious Diseases; Inselspital; Bern University Hospital; University of Bern; Bern Switzerland
2. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Zurich; Zurich Switzerland
3. Institute of Medical Virology; University of Zurich; Zurich Switzerland
4. Institute of Social and Preventive Medicine; University of Bern; Bern Switzerland
5. Institute of Global Health; University of Geneva; Geneva Switzerland
6. Institute of Mathematical Statistics and Actuarial Science; University of Bern; Bern Switzerland
7. Division of Infectious Diseases; Lugano Regional Hospital; Lugano Switzerland
8. Infectious Diseases Service; Department of Medicine; University Hospital of Lausanne (CHUV); Lausanne Switzerland
9. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Basel; Basel Switzerland
10. Division of Infectious Diseases and Hospital Epidemiology; Cantonal Hospital St. Gallen; St. Gallen Switzerland
11. Division of Infectious Diseases; University Hospital Geneva; Geneva Switzerland