1. Department of Obstetrics, Gynecology & Reproductive Sciences, University of California San Francisco, San Francisco, United States
2. Austin Maternal-Fetal Medicine, Austin, United States
3. Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, United States
4. Division of Maternal Fetal Medicine, Obstetrix Medical Group, South Bend, United States
5. Obstetrics and Gynecology, Walter Reed National Military Medical Center, Bethesda, United States
6. Department of Obstetrics, Gynecology, and Women's Health, University of Minnesota, Minneapolis, United States
7. Maternal Fetal Medicine, Intermountain Healthcare and University of Utah, Murray, United States
8. Department of Obstetrics and Gynecology, University of Washington, Seattle, United States
9. Maternal Fetal Medicine, Prevea Health Services, Green Bay, United States
10. Department of Obstetrics and Gynecology, Naval Readiness and Training Command, Twentynine Palms, United States
11. Department of Obstetrics and Gynecology, Tulane University, New Orleans, United States
12. Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, United States
13. Obstetrix Medical Group of Texas, Fort Worth, United States
14. Department of Obstetrics and Gynecology & Reproductive Sciences, University of California Los Angeles, Los Angeles, United States