1. Division of Community Pediatrics, University of California, San Diego, California;
2. Department of Human Development and Family Studies, University of North Carolina, Greensboro, North Carolina
3. Statistics and Epidemiology, Research Triangle Institute, Research Triangle Park, North Carolina
4. Center for Applied Studies in Education, University of Arkansas, Little Rock, Arkansas
5. Institute for Study of Children, Families and Social Issues, Birkbeck University of London, London, United Kingdom
6. Department of Sociology and Population Research Center, University of Texas, Austin, Texas
7. National Institute of Child Health and Human Development, Bethesda, Maryland
8. Division of Nutrition and Physical Activity, Centers for Disease Control and Prevention, Atlanta, Georgia
9. Department of Biobehavioral Health, Pennsylvania State University, University Park, Pennsylvania