[1] Ist Super Sanita, Dept Drug Res & Evaluat, I-00161 Rome, Italy
[2] Catholic Univ, Dept Infect Dis, Rome, Italy
[3] Univ Milan, Clin L Mangiagalli, Dept Obstet & Gynecol 2, Milan, Italy
[4] Univ Turin, AO OIRM S Anna, Dept Obstet & Gynecol, Turin, Italy
[5] INMI L Spallanzani, OU Pediat & Perinatal Infect, Rome, Italy
[6] Univ Modena & Reggio Emilia, Dept Med Specialties, Infect Dis Clin, Modena, Italy
[7] Univ Cagliari, S Giovanni Dio Hosp, Dept Obstet & Gynaecol, Cagliari, Italy
[8] Univ Bologna, St Orsola Malpighi Gen Hosp, Dept Obstet & Gynaecol, Bologna, Italy
[9] Univ Milan, Sacco Hosp, Dept Obstet & Gynaecol, Milan, Italy
[10] Azienda Osped Parma, Dept Infect Dis, Parma, Italy
[11] Univ Milan, S Paolo Hosp, Dept Obstet & Gynecol, Milan, Italy