1. Division of Maternal Fetal Medicine, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA;
2. Department of Obstetrics and Gynecology, Pennsylvania Hospital, Philadelphia, PA, USA;
3. Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA;
4. Atherosclerosis and Thrombosis Unit, I.R.C.C.S. “Casa Sollievo della Sofferenza”, S. Giovanni Rotondo (Foggia), Italy