1. Department of Obstetrics and Gynecology ‘L. Mangiagalli’; Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico; Milan Italy
2. Department of Clinical Science and Community Health; University of Milan; Milan Italy
3. Obstetrics and Gynecology Unit; Humanitas San Pio X; Milan Italy
4. Neonatal Intensive Care Unit; Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico; Milan Italy