Published Online: December 8, 2014. doi:10.1001/jamainternmed.2014.6403.
Study concept and design: Ford, Will.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Ford.
Critical revision of the manuscript for important intellectual content: Will, Mercado, Loustalot.
Statistical analysis: Ford, Will.
Administrative, technical, or material support: Loustalot.
Study supervision: Ford.
Conflict of Interest Disclosures: None reported.
Disclaimer: The findings and conclusions in this article are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.