1 Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, The University of North Carolina School of Medicine, Chapel Hill, NC 27516. Electronic address: asha_talati@med.unc.edu.
2 Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, The University of North Carolina School of Medicine, Chapel Hill, NC 27516.