Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico - Department of Obstetrics and Gynecology, Papa Giovanni XXIII Hospital - Department of Obstetrics and Gynecology, Sacco Hospital-ASST Fatebenefratelli-Sacco Milan - Department of Woman, Mother and Neonate, Università degli Studi di Milano-Bicocca - Department of Maternal Fetal Medicine, University of Brescia - Department of Obstetrics and Gynecology, Papa Giovanni XXIII Hospital - Department of Obstetrics and Gynecology, University of Milan - Department of Clinical Sciences and Community Health, Papa Giovanni XXIII Hospital - Department of Obstetrics and Gynecology, University Hospital Policlinico of Modena - Mother Infant Department, University of Padua - Department of Woman’s and Child’s Health, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico - Department of Obstetrics and Gynecology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico - Department of Obstetrics and Gynecology, Papa Giovanni XXIII Hospital - Department of Neonatology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico - Neonatal Intensive Care Unit, Papa Giovanni XXIII Hospital - Department of Obstetrics and Gynecology, Azienda Ospedaliera Bolognini - Obstetrics and Gynecology Unit, Fondazione IRCCS Policlinico San Matteo - Department of Obstetrics and Gynecology, Madonna delle Grazie Hospital - Department of Obstetrics and Gynecology, P.O. Macedonio Melloni-ASST Fatebenefratelli-Sacco - Obstetrics and Gynecology Unit, Hospital of Treviglio-Caravaggio - Obstetrics and Gynecology Unit, University of Milan - Luigi Sacco Department of Biomedical and Clinical Science, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico - Department of Obstetrics and Gynecology and Children's Hospital "Vittore Buzzi" - Department of Woman, Mother and Neonate