1. Institute for Clinical Epidemiology and Biostatistics; University Hospital of Basel; Basel; Switzerland
2. Division of Infectious Diseases and Hospital Epidemiology; University Hospital; University of Zurich; Zürich; Switzerland
3. Department of Surgery, Service of Transplantation; University Hospital Geneva; Geneva; Switzerland
4. Division of Infectious Diseases and Hospital Epidemiology; University Children's Hospital; Zurich; Switzerland
5. Division of Infectious Diseases and Hospital Hygiene; Kantonsspital St. Gallen; St. Gallen; Switzerland
6. Department of Infectious Diseases; Inselspital; Bern University Hospital and University of Bern; Bern; Switzerland
7. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Basel; Basel; Switzerland
8. Transplantation Center; University Hospital (CHUV) and University of Lausanne; Lausanne; Switzerland