Accepted for Publication: February 28, 2011.
Published Online: May 2, 2011. doi:10.1001/archpediatrics.2011.58
Author Contributions: Study concept and design: Moreno, Jelenchick, Cox, Young, and Christakis. Acquisition of data: Jelenchick and Christakis. Analysis and interpretation of data: Jelenchick, Cox, Young, and Christakis. Drafting of the manuscript: Moreno, Jelenchick, Young, and Christakis. Critical revision of the manuscript for important intellectual content: Jelenchick, Cox, Young, and Christakis. Obtained funding: Christakis. Administrative, technical, and material support: Jelenchick, Cox, and Young. Study supervision: Christakis.
Financial Disclosure: None reported.
Funding/Support: Support for this project was provided by Eunice Kennedy Shriver National Institute of Child Health and Human Development award K12HD055894.
Additional Contributions: Heidi Marleau, MLS, assisted with this project.