Author Contributions: Dr McAlister had full access to all of 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: Toma, McAlister, Armstrong.
Acquisition of data: Toma, Bialy, Adams, Armstrong.
Analysis and interpretation of data: McAlister, Vandermeer, Armstrong.
Drafting of the manuscript: Toma, McAlister.
Critical revision of the manuscript for important intellectual content: Toma, Bialy, Adams, Vandermeer, Armstrong.
Statistical analysis: McAlister, Vandermeer, Armstrong.
Obtained funding: None reported.
Administrative, technical, or material support: Toma, Bialy, Adams, Armstrong.
Study supervision: Toma, McAlister, Armstrong.
Financial Disclosures: None reported.
Funding/Support: Dr McAlister is supported by the Alberta Heritage Foundation for Medical Research, the Canadian Institutes of Health Research, and holds the University of Alberta/Merck Frosst/Aventis Chair in Patient Health Management.
Role of the Sponsor: This project was completed without external funding support and none of Dr McAlister's salary support funders had any input into the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Additional Information: See online
only eTable 1
and eTable 2.
Acknowledgment: We thank the staff of the University of Alberta Evidence-Based Practice Centre for assisting with the hand searches of the abstract books and the literature searches, and Lisa Hartling, MSc, and Carol Friesen, MA, MLIS, The Capital Health Evidence-Based Practice Center, Edmonton, Alberta. Neither Ms Hartling or Ms Friesen received any compensation for assisting with this study.