1. Massachusetts Center for Birth Defects Research and Prevention Boston Massachusetts
2. National Center on Birth Defects and Developmental DisabilitiesCenters for Disease Control and Prevention Atlanta Georgia
3. Texas Department of State Health Services Austin Texas
4. Department of Pediatrics, Section of Hematology‐OncologyBaylor College of Medicine Houston Texas
5. Pennsylvania Department of HealthBureau of Epidemiology Harrisburg Pennsylvania
6. Department of Family and Community MedicineBaylor College of Medicine Houston Texas
7. National Birth Defects Prevention Network Houston Texas
8. Department of Community and Family HealthUniversity of South Florida Tampa Florida