Accepted for Publication: November 27, 2013.
Published Online: May 19, 2014. doi:10.1001/jamapediatrics.2013.5441.
Study concept and design: Wang, Vernon-Smiley, Sheetz.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Wang, Vernon-Smiley, Gapinski, Maughan.
Critical revision of the manuscript for important intellectual content: Wang, Vernon-Smiley, Desisto, Maughan, Sheetz.
Statistical analysis: Wang, Vernon-Smiley.
Administrative, technical, or material support: Wang, Gapinski, Desisto, Maughan.
Study supervision: Wang, Sheetz.
Conflict of Interest Disclosures: None reported.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the official positions of the Centers for Disease Control and Prevention or the Massachusetts Department of Public Health.