Author Contributions: Dr Van Cleave had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Gortmaker, Perrin.
Acquisition of data: Gortmaker.
Analysis and interpretation of data: Van Cleave, Gortmaker, Perrin.
Drafting of the manuscript: Van Cleave, Gortmaker, Perrin.
Critical revision of the manuscript for important intellectual content: Gortmaker, Perrin.
Statistical analysis: Van Cleave, Gortmaker, Perrin.
Obtained funding: Gortmaker, Perrin.
Administrative, technical, or material support: Perrin.
Study supervision: Gortmaker, Perrin.
Financial Disclosures: None reported.
Funding/Support: Preparation of this work was supported by a Robert Wood Johnson Foundation Investigator Award in Health Policy Research (grant 033659), the Centers for Disease Control and Prevention (Prevention Research Centers grant U48DP00064), and a cooperative agreement with the Maternal and Child Health Bureau (U53MC04773).
Role of the Sponsor: The funding agencies had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: This work is solely the responsibility of the authors and does not represent the official views of the Centers for Disease Control and Prevention or other granting institutions.
Additional Contributions: Arthur Sobol, MS, Harvard School of Public Health, helped acquire and analyze a portion of the data presented here. He did not receive compensation for his contribution separate from his supporting grant.