Accepted for Publication: February 16, 2013.
Published Online: May 3, 2013. doi:10.1001/jamapediatrics.2013.2188
Acquisition of data: Halfon, Kuo.
Analysis and interpretation of data: Halfon, Kuo.
Drafting of the manuscript: Halfon.
Critical revision of the manuscript for important intellectual content: Halfon, Kuo.
Statistical analysis: Halfon.
Obtained funding: Halfon.
Administrative, technical, and material support: Halfon, Kuo.
Study supervision: Halfon.
Conflict of Interest Disclosures: None reported.
Additional Contributions: Elizabeth Karp, PhD, and Jennifer Frehn assisted in preparation of the manuscript.