1 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.
2 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9049.