Published Online: July 28, 2014. doi:10.1001/jamainternmed.2014.3456.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Wortham, Hicks.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Shapiro, Hersh,
Administrative, technical, or material support: Wortham.
Study supervision: Hersh, Hicks.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by funding from the Centers for Disease Control and Prevention.
Role of the Sponsor: The Centers for Disease Control and Prevention had no role in the design and conduct of the study; analysis and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.