1. Poverty, Health, and Nutrition Division, International Food Policy Research Institute, Washington, DC, USA
2. Department of Health Promotion, Education, and Behavior, University of South Carolina, Columbia, SC, USA
3. Department of Pediatrics, University of Maryland School of Medicine, Baltimore, MD, USA
4. RTI International, Research Triangle Park, NC, USA
5. USDA/Agricultural Research Service Children's Nutrition Research Center, Departments of Pediatrics and Molecular & Human Genetics, Baylor College of Medicine, Houston, TX, USA