[1] Natl Ctr Dis Prevent & Hlth Promot, Ist Super Sanita, Viale Regina Elena 299, I-00161 Rome, Italy
[2] Univ Roma Tor Vergata, Dept Biomed & Prevent, Viale Montpellier 1, I-00133 Rome, Italy
[3] Univ Hosp Maggiore Carita, Dept Obstet & Gynecol, I-28100 Novara, Italy
[4] Sistema Informat & Mobilita Sanitaria, I-06121 Perugia, Umbria Region, Italy
[5] Osped Maggiore Bologna, Dept Obstet & Gynecol, I-40133 Bologna, Italy
[6] Univ Milan, ASST Fatebenefratelli Sacco, Dept Biomed & Clin Sci, Unit Obstet & Gynecol,Hosp V Buzzi, I-20154 Milan, Italy
[7] Osservatorio Epidemiol Assessorato Salute Reg Sic, I-90145 Palermo, Sicily Region, Italy
[8] Osped Infermi, I-47923 Rimini, Italy
[9] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Unit Obstet, I-55031 Milan, Italy
[10] Univ Hosp Parma, Dept Obstet & Gynecol, I-43126 Parma, Italy
[11] Univ Hosp Verona, Dept Obstet & Gynecol, I-37126 Verona, Italy
[12] Maternal & Child Comm Lombardy Region, I-20124 Milan, Italy
[13] Hosp Beauregard Valle Aosta, I-11100 Aosta, Italy
[14] Annunzio Univ Chieti Pescara, I-66100 Chieti, Italy
[15] Federico II Univ Naples, I-80138 Naples, Italy
[16] Univ Turin, Dept Obstet & Gynecol, I-10124 Turin, Italy
[17] Terr & Integraz Osped Terr, I-60122 Ancona, Marche Region, Italy
[18] IRCCS Burlo Garofolo, Obstet & Gynecol, Inst Maternal & Child Hlth, I-34137 Trieste, Italy
[19] Univ Florence, Div Obstet & Gynecol, Dept Biomed, Expt & Clin Sci, I-50134 Florence, Italy
[20] Azienda Osped Univ, Maternal & Neonatal Dept, I-09042 Cagliari, Italy
[21] Dipartimento Reg Tutela Salute, I-88100 Reggio Di Calabria, Calabria Region, Italy
[22] ASST Papa Giovanni XXIII Hosp, Dept Obstet & Gynecol, I-24127 Bergamo, Italy
[23] Univ Pavia, Dept Obstet & Gynecol, IRCCS Policlin San Matteo Fdn, I-27100 Pavia, Italy
[24] Direz Gen Cura Persona Salute & Welf, Serv Assistenza Terr, I-40127 Bologna, Emilia Romagna, Italy
[25] Univ Brescia, Div Obstet & Gynecol, Dept Clin & Expt Sci, ASST Spedali Civili, I-25123 Brescia, Italy
[26] IRCCS Ist Giannina Gaslini, Neonatal Intens Care Unit, I-16147 Genoa, Italy
[27] ASL TO3 Piedmont Reg, Dept Epidemiol, I-10095 Turin, Italy
[28] Univ Milan, Dept Biomed & Clin Sci, Unit Obstet & Gynecol, ASST Fatebenefratelli Sacco, I-20157 Milan, Italy
[29] San Carlo Hosp, Ctr Reprod Med, I-85100 Potenza, Italy
[30] Osped Civile Antonio Cardarelli, I-86100 Campobasso, Italy
[31] Careggi Univ Hosp, Dept Woman & Childs Hlth, I-50141 Florence, Italy
[32] Cent Teaching Hosp Bozen, Div Gynecol & Obstet, I-39100 Bolzano, Italy
[33] Santa Chiara Hosp, I-38122 Trento, Italy
[34] Univ Modena & Reggio Emilia, Dept Med & Surg Sci Mother Child & Adult, Obstet & Gynecol Unit, I-41124 Modena, Italy
[35] Osped Manzoni, I-23900 Lecce, Italy
[36] Mater Dei Hosp, I-70125 Bari, Italy
[37] Univ Milano Bicocca, Dept Obstet & Gynecol, MBBM Fdn, San Gerardo Hosp, I-20900 Monza, Italy
[38] Univ Pisa, Div Obstet & Gynecol, Dept Expt & Clin Med, I-56126 Pisa, Italy