Published Online: September 8, 2014. doi:10.1001/jamainternmed.2014.2900.
Study concept and design: Johansen, Huerta.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: All authors.
Administrative, technical, or material support: Johansen, Huerta.
Study supervision: Huerta.
Conflict of Interest Disclosures: None reported.
Correction: This article was corrected online September 24, 2014, for an error in the byline.