1. Department of EpidemiologyRollins School of Public Health, Emory University Atlanta Georgia
2. Department of EpidemiologyCollege of Public Health, The University of Iowa Iowa City Iowa
3. Department of Obstetrics and GynecologyUniversity of Chicago Chicago Illinois
4. Congenital Malformations RegistryNew York State Department of Health Albany New York
5. Department of Health and Human PerformanceUniversity of Houston Houston Texas
6. Genetic Disease Screening ProgramCalifornia Department of Public Health Richmond, California
7. Department of EpidemiologyGillings School of Global Public Health, University of North Carolina Chapel Hill North Carolina