Accepted for Publication: December 3, 2012.
Published Online: March 4, 2013. doi:10.1001/jamainternmed.2013.3733
Author Contributions:Study concept and design: Wilt, Khawaja, Butler, and Fink. Acquisition of data: Wilt, MacDonald, and Rutks. Analysis and interpretation of data: Wilt, MacDonald, Ouellette, and Fink. Drafting of the manuscript: Wilt, MacDonald, and Butler. Critical revision of the manuscript for important intellectual content: Ouellette, Khawaja, Rutks, Butler, and Fink. Statistical analysis: Wilt and MacDonald. Obtained funding: Wilt. Administrative, technical, and material support: Wilt, MacDonald, and Rutks. Study supervision: Wilt, Khawaja, and Butler.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study received funding from the Agency for Healthcare Research and Quality (contract No. 290-2007-10064-I).