Accepted for Publication: March 4, 2015.
Published Online: April 23, 2015. doi:10.1001/jamaoncol.2015.0658.
Study concept and design: Metcalfe, Narod.
Acquisition, analysis, or interpretation of data: Metcalfe, Lynch, Tung, Kim-Sing, Olopade, Eisen, Rosen, Snyder, Gershman, Sun, Narod.
Drafting of the manuscript: Metcalfe, Olopade, Snyder, Gershman, Narod.
Critical revision of the manuscript for important intellectual content: Metcalfe, Lynch, Tung, Kim-Sing, Eisen, Rosen, Sun, Narod.
Statistical analysis: Sun, Narod.
Obtained funding: Metcalfe, Narod.
Administrative, technical, or material support: Lynch, Olopade, Snyder, Gershman.
Study supervision: Narod.
Conflict of Interest Disclosures: None reported.
Funding/Support: This research was funded by the Canadian Breast Cancer Foundation (Ontario Chapter). Dr Metcalfe is supported by the Canadian Institutes of Health Research and the Ontario Women’s Health Council.
Role of the Funder/Sponsor: The funding sources 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.