Affiliation: | a Department of Obstetrics, Gynecology and Neonatology, Fondazione “Policlinico-Mangiagalli-Regina Elena,” University of Milan, Milan, Italy b Department of Obstetrics and Gynecology, San Paolo Hospital, University of Milan, Milan, Italy c Department of Obstetrics and Gynecology, Policlinico Borgoroma, University of Verona, Verona, Italy |