1. Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità, Rome, Italy.
2. Department of Infectious Diseases, Catholic University, Rome, Italy.
3. S. Paolo Hospital, Department of Obstetrics and Ginaecology, Milan, Italy.
4. University of Turin, Department of Obstetrics and Ginaecology, and A.O. OIRM S. Anna, Turin, Italy.
5. Department of Obstetrics and Gynaecology, University of Milan and Ospedale Sacco, Milan, Italy.
6. INMI L. Spallanzani, Rome, Italy.
7. Department of Infectious Diseases and Hepatology, Azienda Ospedaliera di Parma, Italy.
8. University of Bari, Department of Obstetrics and Gynaecology, and Policlinic Hospital, Bari, Italy.
9. Department of Infectious Diseases, IRCCS “S. Matteo”, Pavia, Italy.
10. Clinic of Infectious Diseases, Department of Experimental Medicine and Biochemical Sciences, University of Perugia, Italy.
11. University of Palermo, Obstetrics and Gynaecology Clinic, Palermo, Italy.