1 Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Utah Health, 30N 1900 East, Room 2B200, Salt Lake City, UT 84132; Intermountain Healthcare, Salt Lake City, UT. Electronic address: brett.einerson@hsc.utah.edu.
2 Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Utah Health, 30N 1900 East, Room 2B200, Salt Lake City, UT 84132; Intermountain Healthcare, Salt Lake City, UT.
3 Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, CO.