Footnotes

• Contributors Both authors contributed to the conception of the work, interpretation of data, drafting the manuscript, revising the content critically, approval of the version submitted and ongoing accountability for all aspects of the work including questions of accuracy or integrity.

• Funding Division of Behavioral and Cognitive Sciences, Canadian Institute for Advanced Research, BrightFocus Foundation, Canada Research Chair in Medical Decision Science, Alfred P. Sloan Foundation.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.