Accepted for Publication: January 17, 2013.
Published Online: August 5, 2013. doi:10.1001/jamapediatrics.2013.196.
Study concept and design: Tamma, Turnbull, Milstone, Hsu, Cosgrove.
Acquisition of data: Tamma.
Analysis and interpretation of data: Tamma, Turnbull, Harris, Milstone, Cosgrove.
Drafting of the manuscript: Tamma, Turnbull, Harris.
Critical revision of the manuscript for important intellectual content: Turnbull, Harris, Milstone, Hsu, Cosgrove.
Statistical analysis: Tamma, Turnbull.
Administrative, technical, and material support: Hsu, Cosgrove.
Study supervision: Milstone, Cosgrove.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by the Thomas Wilson Sanitarium for Children of Baltimore City, a Clinician Scientist Award from Johns Hopkins Hospital (to Dr Tamma), and grant K24AI079040 from the National Institutes of Health (to Dr Harris).