Published Online: June 4, 2012. doi:10.1001/archinternmed.2012.2013
Author Contributions: Dr Gagne had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Wang, Gagne, and Choudhry. Acquisition of data: Wang and Gagne. Analysis and interpretation of data: Wang, Gagne, and Choudhry. Drafting of the manuscript: Wang and Choudhry. Critical revision of the manuscript for important intellectual content: Wang, Gagne, and Choudhry. Statistical analysis: Wang and Gagne. Administrative, technical, and material support: Gagne. Study supervision: Gagne and Choudhry.
Financial Disclosure: None reported.