Published Online: July 11, 2011. doi:10.1001/archinternmed.2011.295
Author Contributions: Dr Prasad had full access to the data and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Prasad and Cifu. Acquisition of data: Prasad and Gall. Analysis and interpretation of data: Prasad, Gall, and Cifu. Drafting of the manuscript: Prasad. Critical revision of the manuscript for important intellectual content: Prasad, Gall, and Cifu. Statistical analysis: Prasad. Administrative, technical, and material support: Gall. Study supervision: Cifu.
Financial Disclosure: None reported.