title: Reply.
authors.affiliation: Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Utah Health Sciences Center, Salt Lake City, UT. Electronic address: brett.einerson@hsc.utah.edu.
authors.forename: Brett D
authors.initials: BD
authors.lastname: Einerson
authors.affiliation: Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL.
authors.forename: Moeun
authors.initials: M
authors.lastname: Son
authors.affiliation: Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL.
authors.forename: Emily S
authors.initials: ES
authors.lastname: Miller