1. The George Washington University Biostatistics Center, Washington, District of Columbia
2. Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas
3. National Health and Medical Research Council Clinical Trials Centre, University of Sydney, Sydney, Australia
4. Department of Obstetrics and Gynecology, Monash University, Monash, Australia
5. Department of Obstetrics and Gynecology, Toulouse III University, Toulouse, France
6. University of Nottingham, Nottingham, United Kingdom
7. Department of Obstetrics and Gynecology, Academic Medical Center, Amsterdam, The Netherlands
8. Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, Alabama
9. Department of Obstetrics and Gynecology, Thomas Jefferson University, Philadelphia, Pennsylvania
10. Department of Obstetrics and Gynaecology, Hospital Universitari Vall d'Hebron, Barcelona, Spain
11. Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, Pennsylvania
12. Department of Obstetrics and Gynecology, Columbia University, New York, New York
13. Department of Obstetrics and Gynecology, State University of Campinas—UNICAMP, São Paulo, Brazil
14. Division of Extramural Research Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
15. Department of Obstetrics and Gynecology, University of Naples Federico II, Naples, Italy
16. Department of Obstetrics and Gynecology, My Duc Hospital, Ho Chi Minh City, Viet Nam