1. Center for Development and Learning, University Center for Excellence in Developmental Disabilities, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC
2. North Carolina Office on Disability and Health, Raleigh, NC
3. Frank Porter Graham Child Development Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC
4. North Carolina Division of Public Health, North Carolina Department of Health and Human Services, Raleigh, NC