1. Department of Infectious Diseases, Inselspital; Bern University Hospital; University of Bern; Switzerland
2. Institute for Social and Preventive Medicine; Bern University; Bern Switzerland
3. Institute of Mathematics and Statistics; Masaryk University; Brno Czech Republic
4. Department of Infectious Diseases and Hospital Hygiene; Kantonsspital Aarau; Aarau Switzerland
5. Division of Infectious Diseases and Hospital Epidemiology; Zürich University Hospital; Zürich Switzerland
6. Swiss Tropical and Public Health Institute; Basel Switzerland
7. Institute for Epidemiology, Biostatistics and Prevention; University of Zürich; Zürich Switzerland
8. Clinic for Infectious Diseases; University Hospital Basel; Basel Switzerland
9. Department of Infectious Diseases; Geneva University Hospital; Geneva Switzerland
10. Department of Infectious Diseases; Lausanne University Hospital; Lausanne Switzerland
11. Department of Infectious Diseases; Lugano Regional Hospital; Lugano Switzerland
12. Department of Infectious Diseases; St. Gallen Cantonal Hospital; St. Gallen Switzerland