Author Contributions: Dr Willi 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: Willi, Ghali, Cornuz.
Acquisition of data: Willi, Bodenmann.
Analysis and interpretation of data: Willi, Ghali, Faris, Cornuz.
Drafting of the manuscript: Willi, Bodenmann.
Critical revision of the manuscript for important intellectual content: Ghali, Faris, Cornuz.
Statistical analysis: Willi, Ghali, Faris.
Obtained funding: Cornuz.
Administrative, technical, or material support: Bodenmann, Ghali.
Study supervision: Ghali, Cornuz.
Financial Disclosures: None reported.
Funding/Support: Dr Ghali is supported by a Senior Scholar Award from the Alberta Heritage Foundation for Medical Research and by a Canada Research Chair in Health Services Research.
Role of the Sponsor: The agencies that provide Dr Ghali with funding support did not have any role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Additional Contributions: We thank Finlay McAlister, MD, MSc, University of Alberta, for his helpful comments on an earlier version of the manuscript. The authors also thank Anne Parrical, DESS (Diplôme d’Etudes Supérieures Spécialisées), medical library scientist at the University Hospital of Lausanne, for her guidance in formulating our literature searching strategy. These individuals did not receive any compensation for their contribution to the study.