1. Department of Obstetrics and Gynecology, University of Trieste, Trieste, Italy;
2. Department of Obstetrics and Gynecology, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, USA;
3. Department of Surgery, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, USA;
4. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, USA