Author Contributions: Dr Freed had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Freed, Uren, Hudson, Wheeler, Stockman.
Acquisition of data: Uren, Hudson, Wheeler.
Analysis and interpretation of data: Freed, Uren, Hudson, Lakhani, Wheeler, Stockman.
Drafting of the manuscript: Freed, Uren, Hudson.
Critical revision of the manuscript for important intellectual content: Uren, Hudson, Lakhani, Wheeler, Stockman.
Statistical analysis: Freed, Lakhani, Wheeler.
Obtained funding: Freed, Stockman.
Administrative, technical, or material support: Uren, Hudson, Wheeler, Stockman.
Study supervision: Freed.
Financial Disclosures: None reported.
Funding/Support: This study was supported by the American Board of Pediatrics Foundation.
Role of the Sponsor: The American Board of Pediatrics Foundation did not participate in the design and conduct of the study; in the collection, management, analysis, or interpretation of the data; or in the preparation, review, or approval of the manuscript.