Accepted for Publication: October 9, 2014.
Published Online: December 1, 2014. doi:10.1001/jamapediatrics.2014.2815.
Study concept and design: Convit.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Yau, Kim, Convit.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Yau, Kim, Convit.
Obtained funding: Convit.
Administrative, technical, or material support: Yau, Kim, Tirsi.
Study supervision: Yau, Kim, Convit.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by grants DK 083537 from the National Institutes of Health and 1UL1RR029893 from the National Center for Research Resources.
Role of the Funder/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.