1. Division of Infectious Diseases and Hospital Epidemiology, University Children’s Hospital Zurich, Zurich, Switzerland
2. Children’s Hospital of Eastern Switzerland, Infectious Diseases and Hospital Epidemiology, St. Gallen, Switzerland
3. Cantonal Hospital St. Gallen, Infectious Diseases and Hospital Epidemiology, St. Gallen, Switzerland
4. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
5. Department of Gynaecology, University Hospital Zurich, Zurich, Switzerland