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 BiostatisticsCollege of Public Health, The University of Iowa Iowa City Iowa
4. Birth Defects Epidemiology and Surveillance Branch, Texas Department of State Health Services Austin Texas
5. Department of Epidemiology and BiostatisticsUniversity of Albany School of Public Health, State University of New York New York New York
6. Department of Community and Family HealthCollege of Public Health, University of South Florida Florida
7. Birth Defects Monitoring Program, Division of Public Health, North Carolina Department of Health and Human Services Raleigh North Carolina
8. Department of Maternal and Child HealthGillings School of Global Public Health, University of North Carolina at Chapel Hill Chapel Hill North Carolina