1. Dept of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
2. IRCCS Fondazione Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
3. Obstetrics and Gynecology Unit, P.O. Macedonio Melloni-ASST Fatebenefratelli-Sacco, Milan, Italy
4. Dept of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
5. Department of Obstetrics and Gynecology, University of Perugia, S.M. Della Misericordia Hospital, Perugia 06156, Italy