1. Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
2. Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
3. Department of Obstetrics and Gynecology, Stanford University, Sunnyvale, California
4. Reproductive Endocrinology and Infertility Fellowship, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
5. Department of Biostatistics and Epidemiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
6. Department of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan
7. Department of Obstetrics and Gynecology, Pennsylvania State University, Hershey, Pennsylvania
8. Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, Pennsylvania
9. Department of Obstetrics and Gynecology, University of Colorado Denver, Aurora, Colorado
10. Department of Obstetrics and Gynecology, University of Texas Health Science Center at San Antonio, San Antonio, Texas
11. Department of Obstetrics and Gynecology, University of Vermont, Burlington, Vermont
12. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, Michigan
13. Department of Biostatistics, Yale University School of Public Health, New Haven, Connecticut