1 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Utah, Salt Lake City, UT, USA.
2 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Women & Infants Hospital, Warren Alpert Medical School of Brown University, Providence, RI, USA.
3 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Massachusetts Chan Medical School, Worcester, MA, USA.
4 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Medical College of Wisconsin, Froedtert Hospital, Milwaukee, WI 53226, USA. Electronic address: [email protected].