1. National Center on Birth Defects and Developmental Disabilities; Centers for Disease Control and Prevention; Atlanta; Georgia
2. Graduate School of Public Health; University of Pittsburgh; Pittsburgh; Pennsylvania
3. Office of Executive Vice Chancellor and Provost and Departments of Dental Ecology, Epidemiology, and Social Medicine; University of North Carolina at Chapel Hill; Chapel Hill; North Carolina
4. North Carolina Birth Defects Monitoring Program; State Center for Health Statistics; North Carolina Division of Public Health; Raleigh; North Carolina