1. Department of Clinical and Experimental Medicine, Division of Gynecology and Obstetrics, University of Pisa, Pisa, Italy;
2. Gynecological Endocrinology Center, Department of Obstetrics and Gynecology, University of Modena and Reggio Emilia, Modena, Italy;
3. Unit of Obstetrics and Gynecology, Francavilla Fontana Hospital, Francavilla Fontana, Italy