Affiliation: | a Division of Maternal/Fetal Medicine, Department of Obstetrics and Gynecology, Prince George's Hospital Center Cheverly, MD b Maternal/Fetal Medicine, Aurora Women's Pavilion, West Allis, WI c Division of Maternal/Fetal Medicine, Kaiser Permanente Baldwin Park, CA d Department of Obstetrics and Gynecology, Brigham and Women's at Newton-Wellesley Hospital, Newton, MA e Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI f Division of Maternal/Fetal Medicine, University of Southern California School of Medicine, Los Angeles, CA |