1. Department of Obstetrics and GynaecologyUniversity of British Columbia Vancouver British Columbia Canada
2. Office of Population AffairsOffice of the Assistant Secretary for Health Rockville Maryland
3. Department of Obstetrics and GynecologyIrving College of Physicians and SurgeonsColumbia University New York New York
4. Department of EpidemiologyJoseph L. Mailman School of Public HealthColumbia University New York New York
5. Department of Obstetrics and GynecologyRoyal Victoria HospitalResearch Institute of McGill University Health Centre Montreal Quebec Canada
6. Department of Epidemiology, Biostatistics, and Occupational HealthMcGill University Montreal Quebec Canada
7. National Center for Chronic Disease Prevention and Health PromotionCenters for Disease Control and Prevention Atlanta Georgia
8. Maternal and Infant Health BranchDivision of Reproductive HealthNational Center for Chronic Disease Prevention and Health PromotionCenters for Disease Control and Prevention Atlanta Georgia
9. Department of EpidemiologyHarvard T. H. Chan School of Public Health Boston Massachusetts
10. US Department of Health and Human ServicesHealth Resources and Services AdministrationMaternal and Child Health BureauOffice of Epidemiology and Research Rockville Maryland
11. Department of Community and Family HealthUniversity of South Florida College of Public Health Tampa Florida
12. Division of EpidemiologyDepartments of Pediatrics and Obstetrics and GynecologyCenter for Perinatal ResearchThe Research Institute at Nationwide Children's HospitalThe Ohio State University Columbus Ohio
13. Guttmacher Institute New York New York
14. Epidemiology BranchDivision of Intramural Population Health ResearchNational Institute of Child Health and Human Development Bethesda Maryland
15. Department of Medical Informatics and Clinical EpidemiologyOregon Health and Science University Portland Oregon
16. Reproductive Statistics BranchDivision of Vital StatisticsCenters for Disease Control and PreventionNational Center for Health Statistics Hyattsville Maryland
17. Department of Obstetrics and GynecologyUniversity of North Carolina School of Medicine Chapel Hill North Carolina
18. Department of Maternal and Child HealthGillings School of Global Public Health Chapel Hill North Carolina
19. Department of Family ScienceUniversity of Maryland College Park Maryland