1. Department of Epidemiology, Gillings School of Global Public HealthUniversity of North Carolina Chapel Hill North Carolina
2. Department of Obstetrics and Gynecology, Division of Maternal Fetal MedicineUniversity of North Carolina Chapel Hill North Carolina
3. National Center on Birth Defects and Developmental DisabilitiesCenters for Disease Control and Prevention Atlanta Georgia
4. Birth Defects Epidemiology and Surveillance BranchTexas Department of State Health Services Austin Texas
5. Department of Pediatrics, Division of Neonatology and Developmental MedicineStanford University School of Medicine Stanford California
6. Birth Defects Monitoring ProgramNorth Carolina Department of Health and Human Services Raleigh North Carolina