1. Unit of Gynecology and Obstetrics, Department of Human Pathology in Adulthood and Childhood “G. Barresi”, University of Messina, Messina, Italy;
2. Department of Obstetrics and Gynecology, “Filippo Del Ponte” Hospital, University of Insubria, Varese, Italy;
3. Department of BIOMORF, University of Messina, Messina, Italy;
4. Department of Reproduction, University Medical Center Ljubljana, Ljubljana, Slovenia