1. Unit of Gynecology and Obstetrics, Department of Human Pathology in Adulthood and Childhood “G. Barresi”, University of Messina, 98125 Messina, Italy
2. Department of General Surgery and Medical Surgical Specialties, University of Catania, 95125 Catania, Italy
3. Department of Gynecologic Ultrasound Imaging, Altamedica Fetal Maternal Medical Centre, 00198 Rome, Italy