1. Department of Obstetrics and Gynecology, University of Pisa, Pisa, Italy;
2. Department of Obstetrics and Gynecology, University of Genova, Genova, Italy;
3. Sapienza, University of Rome, Rome, Italy;
4. Department of Obstetrics and Gynecology, University of Siena, Siena, Italy;
5. Department of Gynecology, Obstetrics and Urology, Sapienza, University of Rome, Rome, Italy;
6. Department of Obstetrics and Gynecology, University of Florence, Florence, Italy;
7. Obstetrics and Gynecology Unit, Department of General Surgery and Medical Surgical Specialties, University of Catania, Catania, Italy;
8. Department of Obstetrics and Gynecology, “Magna Grecia” University, Catanzaro, Italy;
9. Sapienza, University of Rome & Italian Association for Demographic Education, Rome, Italy;
10. Department of Medical and Surgical Sciences for Mother, Child and Adult, University of Modena and Reggio Emilia, Modena, Italy;
11. Gynecology and Obstetrics Unit, Department of Neuroscience, Reproductive Sciences and Dentistry, University of Napoli Federico II, Napoli, Italy;
12. Department of Obstetrics and Gynecology, University of Bologna, Bologna, Italy;
13. Department of Surgical Sciences, Department of Obstetrics and Gynecology, University of Cagliari, Cagliari, Italy