1. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Basel; Basel Switzerland
2. University Clinic for Infectious Diseases; University Hospital Bern and University of Bern; Bern Switzerland
3. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Zurich; Zurich Switzerland
4. Infectious Diseases Service; University Hospital and University of Lausanne; Lausanne Switzerland
5. Division of Infectious Diseases; University Hospital Geneva; Geneva Switzerland
6. Cantonal Hospital; St. Gallen Switzerland
7. Division of Infectious Diseases; Regional Hospital; Lugano Switzerland