1. Department of Epidemiology, Gillings School of Global Public Health; University of North Carolina; Chapel Hill North Carolina
2. Department of Nutrition, Gillings School of Global Public Health; University of North Carolina; Chapel Hill North Carolina
3. Adult and Child Consortium for Health Outcomes Research and Delivery Science; University of Colorado Anschutz Medical Campus; Aurora Colorado
4. North Carolina Birth Defects Monitoring Program, State Center for Health Statistics, North Carolina Division of Public Health; Raleigh North Carolina
5. Department of Maternal and Child Health, Gillings School of Global Public Health; University of North Carolina; Chapel Hill North Carolina