1. Infectious Diseases, and
2. Obstetrics and Gynecology, Bern University Hospital, University of Bern, Switzerland;
3. Division of Infectious Diseases, HIV/AIDS Unit, Geneva University Hospitals, Switzerland;
4. University Department of Medicine, Kantonsspital Baselland, Bruderholz, University of Basel, Switzerland;
5. Service of Infectious Diseases, Lausanne University Hospital and University of Lausanne, Switzerland;
6. Department of Infectious Diseases, Cantonal Hospital St.Gallen, Switzerland;
7. Department of Obstetrics and Gynecology, Regional Hospital, Lugano, Switzerland;
8. Department of Obstetrics and Gynecology, Kantonsspital Winterthur, Switzerland;
9. Division of Infectious Diseases and Hospital Epidemiology, University Hospital and University of Zürich, Switzerland; and
10. Institute of Medical Virology, University Zurich, Switzerland.