Accepted for Publication: June 7, 2012.
Published Online: September 10, 2012. doi:10.1001/archinternmed.2012.3992
Author Contributions:Study concept and design: Leung, McAlister, Wright, and Bates. Acquisition of data: Rogers. Analysis and interpretation of data: Leung, McAlister, Rogers, Pazo, Wright, and Bates. Drafting of the manuscript: Leung. Critical revision of the manuscript for important intellectual content: Leung, McAlister, Rogers, Pazo, Wright, and Bates. Statistical analysis: Leung. Obtained funding: Bates. Administrative, technical, and material support: Rogers and Bates. Study supervision: Rogers and Bates.
Financial Disclosure: None reported.
Funding/Support: Dr Leung is supported by a Clinical Fellowship Award from Alberta Innovates–Health Solutions and by a Fellowship Award from the Canadian Institutes for Health Research. Dr McAlister is supported by a career salary award from Alberta Innovates–Health Solutions as a senior health scholar.
Disclaimer: The American College of Surgeons National Surgical Quality Improvement Program and the hospitals participating in the ACS NSQIP are the source of the data used herein; they have not verified and are not responsible for the statistical validity of the data analysis or the conclusions derived by the authors.