1. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
2. RTI International, Research Triangle Park, North Carolina
3. Department of Neurology, Northwestern University, Chicago, Illinois
4. Department of Obstetrics and Gynecology, University of Utah and Intermountain Healthcare, Salt Lake City, Utah
5. Department of Obstetrics and Gynecology, School of Medicine, Indiana University, Indianapolis, Indiana
6. Department of Obstetrics and Gynecology, University of California, Irvine, Orange, California
7. Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland
8. Department of Obstetrics and Gynecology, Columbia University, New York, New York
9. Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, Pennsylvania
10. Department of Obstetrics and Gynecology, University of Texas Medical Branch, University of Texas, Galveston, Texas
11. Department of Obstetrics and Gynecology, Case Western Reserve University, Cleveland, Ohio
12. Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
13. Department of Obstetrics and Gynecology Medicine, Northwestern University, Chicago, Illinois