Study concept and design: Gulamhusein, Yun, Paszat, Warde, Alibhai.
Acquisition, analysis, or interpretation of data: Gulamhusein, Yun, Cheung, Sutradhar, Paszat, Alibhai.
Drafting of the manuscript: Gulamhusein, Sutradhar, Paszat, Alibhai.
Critical revision of the manuscript for important intellectual content: Gulamhusein, Yun, Cheung, Paszat, Warde, Alibhai.
Statistical analysis: Yun, Sutradhar.
Obtained funding: Paszat, Alibhai.
Administrative, technical, or material support: Cheung.
Study supervision: Sutradhar, Paszat, Warde, Alibhai.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Cheung reported receiving honoraria from Merck for continuing medical education events. No other disclosures were reported.
Funding/Support: Support was provided in part by Toronto General and the Toronto Western Hospital Research Foundation. Dr Alibhai is a research scientist of the Canadian Cancer Society. Dr Cheung is supported by a senior investigator award from the Canadian Institutes of Health Research.
Role of the Funder/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.