1 University of Utah Health, Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Salt Lake City, UT; Intermountain Healthcare, Salt Lake City, UT. Electronic address: brett.einerson@hsc.utah.edu.
2 University of Utah Health, Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Salt Lake City, UT; Intermountain Healthcare, Salt Lake City, UT.
3 University of Colorado School of Medicine, Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Aurora, CO.