1. Department of Obstetrics and Gynecology, Biomedical, Experimental and Clinical Sciences, University Hospital Careggi, Florence, Italy
2. Department of Integrated Care Services, Prehospitalization Unit, Policlinico di Tor Vergata, Rome, Italy
3. Department of Anesthesia and Intensive Care, Unit of Obstetric and Gynecologic Anesthesia, Azienda Ospedaliero Universitaria Careggi, Florence, Italy
4. Department of Obstetrics and Gynecology, Unit of Obstetrics, Department of Woman, Child, and Newborn, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Milan, Italy
5. Obstetrics and Gynecology Unit, Department of Medicine and Surgery, University of Parma, Parma, Italy
6. Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
7. Maternal Infant Department SC, Obstetrics and Gynecology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
8. Department of Anesthesia and Resuscitation in Obstetrics, San Giovanni Calibita Fatebenefratelli Hospital, Rome, Italy
9. Obstetrics and Gynecology Unit, IRCCS Istituto Giannina Gaslini, Genova, Italy