Accepted for Publication: October 13, 2014.
Published Online: December 8, 2014. doi:10.1001/jamainternmed.2014.6512.
Study concept and design: Fournier, Azoulay, Suissa.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Fournier, Suissa.
Critical revision of the manuscript for important intellectual content: Fournier, Azoulay, Yin, Montastruc, Suissa.
Statistical analysis: Fournier, Azoulay, Yin, Suissa.
Obtained funding: Suissa.
Administrative, technical, or material support: Suissa.
Study supervision: Suissa.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded in part by research grants from the Canadian Institutes of Health Research and Canada Foundation for Innovation. Dr Suissa is the recipient of the James McGill Chair.
Role of the Sponsor: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.