Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Kessler reported that he has been a consultant for AstraZeneca, Analysis Group, Bristol-Myers Squibb, Cerner-Galt Associates, Eli Lilly, GlaxoSmithKline, HealthCore, Health Dialog, Hoffman-LaRoche, Integrated Benefits Institute, J & J Wellness & Prevention, John Snow, Kaiser Permanente, Lake Nona Institute, Matria, Mensante, Merck, Ortho-McNeil Janssen Scientific Affairs, Pfizer, Primary Care Network, Research Triangle Institute, sanofi-aventis, Shire US, SRA International, Takeda Global Research & Development, Transcept Pharmaceuticals, and Wyeth-Ayerst; has served on advisory boards for Appliance Computing II, Eli Lilly, Mindsite, Ortho-McNeil Janssen Scientific Affairs, Johnson & Johnson, Plus One Health Management, and Wyeth-Ayerst; has had research support for his epidemiological studies from Analysis Group Inc, Bristol-Myers Squibb, Eli Lilly & Company, EPI-Q, GlaxoSmithKline, Johnson & Johnson Pharmaceuticals, Ortho-McNeil Janssen Scientific Affairs, Pfizer, sanofi-aventis, Shire US, and Walgreens; and owns 25% share in DataStat. Dr Gennetian reported that he has served on advisory boards for Family Self Sufficiency TWG, Administration for Children and Families, and National Opinion Research Center, University of Chicago. Dr Katz reported that he has served on advisory boards for Manpower Demonstration Research Corporation and the Russell Sage Foundation. Dr Ludwig reported that he serves on advisory boards (uncompensated) for Uhlich Children’s Advantage Network (Chicago), and the Board on Children, Youth and Families Institute of Medicine/National Academy of Sciences; and has served as a consultant for the MacArthur Foundation Network on Children and Housing and the MDRC Early Childhood Institute. The remaining authors report no conflicts of interest.