title: Reply.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College, Thomas Jefferson University, 833 Chestnut, Philadelphia, PA 19107. Electronic address: vincenzo.berghella@jefferson.edu.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Berghella
authors.affiliation: Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples Federico II, Naples, Italy.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Saccone