Published Online: December 29, 2014. doi:10.1001/jamapediatrics.2014.2767.
Study concept and design: Estrada, Arnold.
Acquisition, analysis, or interpretation of data: Golden, Xu, Arnold.
Drafting of the manuscript: Golden, Arnold.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Xu.
Obtained funding: Arnold.
Administrative, technical, or material support: Golden.
Study supervision: Estrada, Arnold.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by grant K23 HL80005 from the National Institutes of Health (Dr Arnold) and Clinical and Translational Science Award UL1 RR024975 (Vanderbilt Institute for Clinical and Translational Research).
Role of the Funder/Sponsor: The funding sources 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.