Published Online: February 10, 2014. doi:10.1001/jamapediatrics.2013.4653.
Study concept and design: Grant, Gracy, Johnson.
Acquisition of data: Grant, Gracy, Goldsmith.
Analysis and interpretation of data: Grant, Gracy, Goldsmith, Sobelson.
Drafting of the manuscript: Grant, Gracy.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Grant, Goldsmith.
Obtained funding: Johnson.
Administrative, technical, and material support: Grant, Goldsmith, Sobelson, Johnson.
Study supervision: Gracy.
Conflict of Interest Disclosures: None reported.
Funding/Support: The Children’s Health Fund Transportation Initiative is supported by The W. K. Kellogg Foundation and The Kresge Foundation.
Role of the Sponsor: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Correction: This article was corrected on February 11, 2014, to update the corresponding author’s e-mail address.