Accepted for Publication: December 8, 2014.
Published Online: March 9, 2015. doi:10.1001/jamapediatrics.2014.3561.
Study concept and design: Fontanella, Phillips, Bridge, Lester, Sweeney, Campo.
Acquisition, analysis, or interpretation of data: Fontanella, Hiance-Steelesmith, Phillips, Lester, Campo.
Drafting of the manuscript: Fontanella, Phillips, Lester, Sweeney, Campo.
Critical revision of the manuscript for important intellectual content: Fontanella, Hiance-Steelesmith, Bridge, Sweeney, Campo.
Statistical analysis: Fontanella, Hiance-Steelesmith, Phillips.
Administrative, technical, or material support: Fontanella, Hiance-Steelesmith, Sweeney, Campo.
Study supervision: Fontanella, Campo.
Conflict of Interest Disclosures: None reported.
Funding/Support: The project described was supported by award number UL1RR025755 from the National Center for Research Resources.
Role of the Funder/Sponsor: The National Center for Research Resources 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.
Disclaimer: The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the National Center for Research Resources.
Correction: This article was corrected on March 25, 2015, to fix a typographical error in the text.