1. Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC, USA
2. Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
3. Carolina Population Center, University of North Carolina at Chapel Hill, NC, USA
4. RTI International, Social Policy, Health, and Economic Research Unit, Research Triangle Park, NC, USA
5. University of Kentucky at Lexington, Lexington, KY, USA