1 Department of Maternal and Child Health and Urological Sciences, Sapienza University of Rome, Rome, Italy.
2 Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples Federico II, Naples, Italy.
3 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College of Thomas Jefferson University, 833 Chestnut, Philadelphia, PA 19107. Electronic address: vincenzo.berghella@jefferson.edu.