Published Online: April 7, 2014. doi:10.1001/jamainternmed.2014.518.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Decker.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Decker, Long.
Administrative, technical, or material support: Kenney.
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 views of the Centers for Disease Control and Prevention or The Urban Institute.