1. Department of Infectious Diseases Bern University Hospital, University of Bern Bern Switzerland
2. Departement of Obstetrics and Gynecology Bern University Hospital and University of Bern Bern Switzerland
3. Department of Infectious Diseases University Hospital Geneva Geneva Switzerland
4. Department of Infectious Diseases University Hospital Basel Bruderholz Switzerland
5. Department of Infectious Diseases University Hospital Lausanne Lausanne Switzerland
6. Department of Infectious Diseases Cantonal Hospital St.Gallen St.Gallen Switzerland
7. Department of Obstetrics and Gynecology Regional Hospital Lugano Switzerland
8. Department of Obstetrics and Gynecology University Hospital and University of Zurich Zurich Switzerland
9. Division of Infectious Diseases and Hospital Epidemiology University Hospital and University of Zürich Zurich Switzerland