1. Department of Epidemiology, Environmental and Occupational Health Sciences Institute, Rutgers School of Public Health, 170 Frelinghuysen Road, Piscataway, NJ, USA
2. Department of Obstetrics and Gynecology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY, USA
3. Department of Biostatistics and Computational Biology, University of Rochester School of Medicine and Dentistry, 265 Crittenden Avenue, Rochester, NY, USA
4. Department of Obstetrics and Gynecology, Penn State University College of Medicine, 500 University Drive, Hershey, PA, USA
5. Department of Obstetrics and Gynecology, Warren Alpert School of Medicine, Brown University, 90 Plain Street, Providence, RI, USA
6. Department of Obstetrics and Gynecology, Stanford University School of Medicine, 1195 West Fremont Avenue, Sunnyvale, CA, USA
7. Department of Obstetrics and Gynecology, University of Alabama at Birmingham, 619 19th Street South, Birmingham, AL, USA
8. Department of Obstetrics and Gynecology, University of Vermont, 111 Colchester Avenue, Burlington, VT, USA
9. Department of Obstetrics and Gynecology, Perelman School of Medicine, University of Pennsylvania, 3701 Market Street, Philadelphia, PA, USA
10. Fertility and Infertility Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, 6710B Rockledge Drive, Bethesda, MD, USA
11. Department of Obstetrics and Gynecology, University of Oklahoma College of Medicine, 825 NE 10th Street, Oklahoma City, OK, USA
12. Department of Obstetrics and Gynecology, Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, 275 E. Hancock, Detroit, MI, USA
13. Department of Obstetrics and Gynecology, University of Texas Health Science Center at San Antonio, 8300 Floyd Curl Drive, San Antonio, TX, USA
14. Department of Reproductive Endocrinology and Infertility, University of California, 550 16th Street, San Francisco, CA, USA
15. Carolinas Health Care System, 1025 Morehead Medical Drive, Charlotte, NC, USA
16. Yale School of Public Health, 300 George Street, New Haven, CT, USA
17. Department of Obstetrics and Gynecology, University of Colorado, 12631 E 17th Avenue, Aurora, CO, USA
18. Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, 1120 15th Street, Augusta, GA, USA