Author Contributions: Dr Ravaud 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: Mathieu, Boutron, Ravaud.
Acquisition of data: Mathieu, Boutron, Ravaud.
Analysis and interpretation of data: Mathieu, Boutron, Moher, Altman, Ravaud.
Drafting of the manuscript: Mathieu, Boutron, Ravaud.
Critical revision of the manuscript for important intellectual content: Mathieu, Boutron, Moher, Altman, Ravaud.
Statistical analysis: Mathieu, Ravaud.
Obtained funding: Ravaud.
Administrative, technical, or material support: Moher, Ravaud.
Study supervision: Ravaud.
Financial Disclosures: None reported.
Funding/Support: French Society of Rheumatology supported Dr Mathieu during his clinical research board.
Role of the Sponsor: The French Society of Rheumatology had no 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.
This article was corrected online for error in data on 9/10/2009, prior to publication of the correction in print.