1. Department of EpidemiologyGillings School of Global Public Health, University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
2. Program in Health Disparities ResearchUniversity of Minnesota Twin Cities Minneapolis Minnesota USA
3. Department of PediatricsStanford University School of Medicine Stanford California USA
4. State Center for Health StatisticsNorth Carolina Birth Defects Monitoring Program Raleigh North Carolina USA
5. Department of Maternal and Child HealthGillings School of Global Public Health, University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
6. Department of OphthalmologyDuke University Medical Center Durham North Carolina USA