1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Columbia University, New York, New York
2. Department of Neonatology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
3. George Washington University Biostatistics Center, Washington, DC
4. Department of Obstetrics and Gynecology, Northwestern University, Chicago, Illinois
5. Department of Obstetrics and Gynecology, University of Texas Health Science Center at Children’s Memorial Hermann Hospital, Houston
6. Department of Obstetrics and Gynecology, University of Alabama, Birmingham
7. Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
8. Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia
9. Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston
10. Department of Obstetrics and Gynecology, Brown University, Providence, Rhode Island
11. Department of Obstetrics and Gynecology, Ohio State University, Columbus
12. Department of Obstetrics and Gynecology, University of Utah Health Sciences Center, Salt Lake City
13. Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill, Chapel Hill
14. MetroHealth Medical Center, Case Western Reserve University, Cleveland, Ohio
15. Department of Obstetrics and Gynecology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora
16. Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina
17. Department of Obstetrics and Gynecology, Stanford University, Stanford, California
18. Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas
19. Department of Obstetrics and Gynecology, University of Pittsburgh, Pittsburgh, Pennsylvania
20. Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland
21. Department of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan
22. Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston