Accepted for Publication: December 19, 2014.
Published Online: March 9, 2015. doi:10.1001/jamapediatrics.2014.3809.
Study concept and design: Friedman, Beck, Geary, Freedman.
Acquisition, analysis, or interpretation of data: Friedman, Beck, DeGroot, Sklansky, Freedman.
Drafting of the manuscript: Friedman, Freedman.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Friedman, Beck, DeGroot, Freedman.
Obtained funding: Friedman, Beck, Freedman.
Administrative, technical, or material support: DeGroot, Sklansky, Freedman.
Study supervision: Friedman, Freedman.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by grants from Physicians’ Services Incorporated Foundation and Department of Paediatrics, The Hospital for Sick Children.
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 the decision to submit the manuscript for publication.