1. Unit of Gynecology and Obstetrics, Department of Human Pathology in Adulthood and Childhood “G. Barresi”, University of Messina, Messina, Italy;
2. Department of General Surgery and Medical Surgical Specialties, University of Catania, Catania, Italy;
3. Department of Obstetrics and Gynecologic Ultrasound, Altamedica Fetal Maternal Medical Center, Rome, Italy