1. Unit of Obstetrics, Department of Woman, Newborn and Child, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
2. Department of Clinical Sciences and Community Health, Università degli Studi di Milano, 20122 Milan, Italy
3. Unit of Emergency Surgery, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy