1 Department of Obstetrics, Gynecology, and Reproductive Sciences, Division of Maternal-Fetal Medicine, University of California, San Francisco, San Francisco, CA. Electronic address: [email protected].
2 Nebraska Methodist Women's Hospital and Perinatal Center, Omaha, NE.
3 Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Texas Health-University of Texas Medical School at Houston, Houston, TX.