title: Reply.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Thomas Jefferson University, Philadelphia, PA. Electronic address: amanda.roman@jefferson.edu.
authors.forename: Amanda
authors.initials: A
authors.lastname: Roman
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Thomas Jefferson University, Philadelphia, PA.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Berghella