1. Department of Diagnostics, Clinical and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy;
2. Department of Obstetrics and Gynaecology, University of Texas Health Science Center, Houston, USA;
3. Unit of Obstetrics and Gynecology, Department of Medical and Surgical Sciences for Children and Adults, University of Modena and Reggio Emilia, Modena, Italy