1. Department of Obstetrics and Gynecology, Azienda Ospedaliero Universitaria, Presidio Policlinico di Monserrato, University of Cagliari, Monserrato, Italy;
2. Department of Obstetrics and Gynecology, San Francesco Hospital, Nuoro, Italy;
3. Department of Obstetrics and Gynecology, University of Pisa, Pisa, Italy;
4. Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy;
5. Department of Gynaecological Sciences and Human Reproduction, University of Padua, Padua, Italy;
6. Macedonio Melloni Hospital, Milano, Italy;
7. Department of Medical and Surgical Sciences, Institute of Obstetrics and Gynecology, University of Foggia, Foggia, Italy