Published Online: December 3, 2012. doi:10.1001/2013.jamainternmed.834
Author Contributions: Dr Drekonja had full access to all 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: Drekonja and Johnson. Acquisition of data: Drekonja and Zarmbinski. Analysis and interpretation of data: Drekonja and Johnson. Drafting of the manuscript: Drekonja. Critical revision of the manuscript for important intellectual content: Drekonja, Zarmbinski, and Johnson. Statistical analysis: Drekonja. Obtained funding: Drekonja. Administrative, technical, and material support: Drekonja. Study supervision: Drekonja and Johnson. Final approval of manuscript: Drekonja, Zarmbinski, and Johnson.
Conflict of Interest Disclosures: Dr Johnson has research grants or contracts with Merck, Rochester Medical, and Syntiron.
Funding/Support: The study was supported by the resources of the Minneapolis Veterans Affairs Health Care System, including the Center for Epidemiological and Clinical Research and the Center for Chronic Disease Outcomes Research. Ms Zarmbinski has received scholarship support from the Infectious Diseases Society of America Medical Scholars Program.
Additional Contributions: Briana Ludtke, BA, and Kristina Poss provided assistance in conducting the study.