Published Online: February 25, 2013. doi:10.1001/jamainternmed.2013.2781
Author Contributions:Study concept and design: Diamantouros, Bartle, and Geerts. Acquisition of data: Diamantouros. Analysis and interpretation of data: Diamantouros, Bartle, and Geerts. Drafting of the manuscript: Diamantouros and Geerts. Critical revision of the manuscript for important intellectual content: Diamantouros, Bartle, and Geerts. Statistical analysis: Diamantouros. Administrative, technical, and material support: Geerts. Study supervision: Bartle and Geerts.
Conflict of Interest Disclosures: Dr Bartle is the author of the warfarin information sheet for the Thrombosis Interest Group of Canada.