1. Department of Obstetrics and Gynecology, “Filippo Del Ponte” Hospital, University of Insubria, Varese, Italy
2. Department of Obstetrics and Gynecology, AOUI Verona, University of Verona, Verona, Italy
3. Department of Reproduction, University Medical Center Ljubljana, Ljubljana, Slovenia
4. Department of Gynecology, University Medical Center Ljubljana, Ljubljana, Slovenia