title: Reply.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9049. Electronic address: emily.adhikari@utsouthwestern.edu.
authors.forename: Emily H
authors.initials: EH
authors.lastname: Adhikari
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9049.
authors.forename: David B
authors.initials: DB
authors.lastname: Nelson