1. Congenital Malformations Registry, Center for Environmental Health, New York State Department of Health; Albany New York
2. Division of Intramural Population Health Research; Eunice Kennedy Shriver National Institute of Child Health and Human Development; Bethesda Maryland
3. Center for Birth Defects Research and Prevention; Massachusetts Department of Health; Boston Massachusetts
4. Division of Birth Defects Research, Department of Pediatrics, College of Medicine; University of Arkansas for Medical Sciences and Arkansas Children's Research Institute; Little Rock Arkansas
5. Birth Defects Epidemiology and Surveillance Branch; Texas Department of State Health Services; Austin Texas
6. Michigan Department of Community Health; Lansing Michigan
7. Illinois Department of Public Health; Springfield Illinois
8. University of South Florida; Tampa Florida