1. Children’s Hospital of Eastern Switzerland, Infectious Diseases and Hospital Epidemiology, St Gallen, Switzerland / Cantonal Hospital St Gallen, Department of Infectious Diseases and Hospital Epidemiology, St Gallen, Switzerland
2. Department of Infectious Diseases, Bern University Hospital, University of Bern, Switzerland
3. Division of Infectious Diseases, Ospedale Regionale di Lugano, Switzerland
4. Department of Obstetrics and Gynaecology, Faculty of Medicine, University Hospitals of Geneva, Switzerland
5. Children's Research Center, University Children's Hospital of Zurich, University of Zurich, Switzerland
6. Children's Research Center, University Children's Hospital of Zurich, University of Zurich, Switzerland / Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zurich, Switzerland
7. University Children's Hospital, Basel, Switzerland
8. Department of Pediatrics, University Hospitals of Geneva, Switzerland
9. Cantonal Hospital St Gallen, Department of Infectious Diseases and Hospital Epidemiology, St Gallen, Switzerland