1. Department of Obstetrics and Gynecology (R.S.L., W.C.D., C.L.G., S.J.E.), Penn State College of Medicine, Hershey, Pennsylvania
2. Department of Public Health Sciences (R.S.L., A.R.K., C.M.S.), Penn State College of Medicine, Hershey, Pennsylvania
3. Department of Nutritional Sciences (P.M.K.-E.), Penn State College of Health and Human Development, University Park, Pennsylvania
4. Department of Kinesiology (N.W.), Penn State College of Health and Human Development, University Park, Pennsylvania
5. Departments of Psychiatry (K.C.A., D.B.S.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania1
6. Department of Surgery (D.B.S.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
7. Department of Obstetrics and Gynecology (M.P.D.), Wayne State University, Detroit, Michigan
8. Department of Obstetrics and Gynecology (W.D.S.), University of Colorado, Denver, Colorado
9. Department of Obstetrics and Gynecology (P.R.C.), University of Vermont, Burlington, Vermont
10. Department of Obstetrics and Gynecology (G.M.C.), University of Michigan, Ann Arbor, Michigan
11. Department of Obstetrics and Gynecology (K.T.B., C.C., A.D.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
12. Department of Obstetrics and Gynecology (W.B.), University of Alabama Birmingham, Birmingham, Alabama
13. Carolinas Medical Center (R.U.), Charlotte, North Carolina
14. Department of Obstetrics and Gynecology (S.L.), Virginia Commonwealth University, Richmond, Virginia
15. Department of Obstetrics and Gynecology (V.B.), Stanford University Medical Center, Stanford, California
16. Department of Biostatistics (H.H.), Yale University School of Public Health, New Haven, Connecticut
17. Fertility and Infertility Branch (E.E.), Eunice Kennedy Shriver NICHD, Rockville, Maryland