Published Online: September 22, 2014. doi:10.1001/jamainternmed.2014.4513.
Study concept and design: McDonald, Lee.
Acquisition, analysis, or interpretation of data: Dounaevskaia, Lee.
Drafting of the manuscript: Dounaevskaia, Lee.
Critical revision of the manuscript for important intellectual content: McDonald, Lee.
Statistical analysis: Lee.
Administrative, technical, or material support: McDonald.
Study supervision: Lee.
Conflict of Interest Disclosures: None reported.
Additional Contributions: Yash Patel, MD, MSc, FRCPC, and Isaac I. Bogoch, MD, MPH, FRCPC, Department of Medicine, University of Toronto, participated in data collection and did not receive compensation for their roles.