Author Contributions: Drs Katz, Stewart, and Shiraishi had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Katz, Stewart, and Taylor. Acquisition of data: Katz, Shiraishi, Mears, and Taylor. Analysis and interpretation of data: Katz, Stewart, and Taylor. Drafting of the manuscript: Katz and Shiraishi. Critical revision of the manuscript for important intellectual content: Katz, Stewart, Mears, and Taylor. Statistical analysis: Taylor. Obtained funding: Taylor. Administrative, technical, and material support: Katz, Stewart, Shiraishi, Mears, and Taylor. Study supervision: Katz, Mears, and Taylor.
Financial Disclosure: None reported.
Funding/Support: Supported by grant R01HD4330101A1 from the National Institute of Child Health and Human Development.
Additional Contributions: We thank all of the Clinical Research Center study nurses who helped us with the study and the Pediatric Practice Research Group and all of the physicians and school nurses who referred patients into our study.