[1] Univ Florence, Dept Expt & Clin Med, Florence, Italy
[2] Careggi Univ Hosp, Infect & Trop Dis Unit, Florence, Italy
[3] Tuscany Reg Referral Ctr Infect Dis Pregnancy, Florence, Italy
[4] Univ Brescia, Dept Infect & Trop Dis, Azienda Socio Sanit Territoriale ASST Spedali Civ, Brescia, Italy
[5] IRCCS, Natl Inst Infect Dis Lazzaro Spallanzani, Rome, Italy
[6] Azienda Osped Univ Bologna, Ist Ricovero & Cura Carattere Sci IRCCS, Obstet Unit, Bologna, Italy
[7] Alma Mater Studiorum Univ Bologna, Dept Med & Surg Sci, Bologna, Italy
[8] Univ Naples Federico II, Dept Publ Hlth, Naples, Italy
[9] Fdn IRCCS San Gerardo Tintori, Dept Obstet, Monza, Italy
[10] Univ Milano Bicocca, Sch Med & Surg, Monza, Italy
[11] Univ Brescia, Dept Clin & Expt Sci, Infect & Trop Dis Unit, Brescia, Italy
[12] Magna Graecia Univ Catanzaro, Dept Med & Surg Sci, Infect & Trop Dis Unit, Catanzaro, Italy
[13] Bambino Gesu Pediat Hosp, Infect Dis Unit, Rome, Italy
[14] Univ Florence, Dept Stat Comp Sci, Applicat G Parenti, Florence, Italy
[15] Meyer Childrens Hosp IRCCS, Infect Dis Unit, Florence, Italy
[16] Univ Florence, Dept Hlth Sci, Florence, Italy
[17] Fdn IRCCS Policlin San Matteo, Microbiol & Virol Unit, Pavia, Italy
[18] Fdn IRCCS Policlin San Matteo, Infect Dis Unit, Pavia, Italy
[19] Fdn IRCCS Policlin San Matteo, Dept Obstet & Gynecol, Pavia, Italy
[20] Univ Bari Aldo Moro, Dept Precis & Regenerat Med & Ionian Area, Bari, Italy
[21] Univ Naples Federico II, Dept Translat Med Sci, Div Neonatol, Naples, Italy
[22] Univ Brescia, Dept Clin & Expt Sci, Div Obstet & Gynecol, ASST Spedali Civili, Brescia, Italy
[23] Bambino Gesu Pediat Hosp, Fetal & Perinatal Med & Surg Unit, Rome, Italy
[24] Microbiol Unit, IRCCS Azienda Ospeda liero Universitaria Bologna, Bologna, Italy