Accepted for Publication: December 22, 2011.
Published Online: March 12, 2012. doi:10.1001/archinternmed.2011.2315
Author Contributions: Dr Stelfox and Mr Gao had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Stelfox, Hemmelgarn, Bagshaw, Doig, Nijssen-Jordan, and Manns. Acquisition of data: Stelfox, Bagshaw, and Doig. Analysis and interpretation of data: Stelfox, Hemmelgarn, Bagshaw, Gao, Nijssen-Jordan, and Manns. Drafting of the manuscript: Stelfox, Hemmelgarn, Gao, and Nijssen-Jordan. Critical revision of the manuscript for important intellectual content: Stelfox, Hemmelgarn, Bagshaw, Doig, Nijssen-Jordan, and Manns. Statistical analysis: Bagshaw and Gao. Obtained funding: Stelfox, Hemmelgarn, Doig, and Manns. Administrative, technical, and material support: Stelfox, Bagshaw, Doig, and Nijssen-Jordan.
Financial Disclosure: None reported.
Funding/Support: This project was supported by operating grant H1N-104065 from the Canadian Institutes of Health Research. Dr Stelfox is supported by a New Investigator Award from the Canadian Institutes of Health Research. Drs Stelfox and Hemmelgarn are supported by Population Health Investigator awards from Alberta Innovates. Dr Bagshaw is supported by a Clinical Investigator Award from Alberta Innovates. Dr Manns is supported by a Scholar Award from Alberta Innovates.
Additional Contributions: David Megran, MD, gave comments on early versions of the article, and Alberta Health Services provided access to clinical and administrative databases.