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Contributors All authors conceived and designed the article. MJ, MM and DK drafted it. AD reviewed it for important intellectual content. All authors approved the final version.
Funding MJ, DK and AD are affiliated with the Imperial Patient Safety Translational Research Centre at Imperial College London, which receives centre funding from the National Institute for Health Research (Grant number 40490). The Higher Education Funding Council for England (HEFCE) funds the HELIX Centre (project code H10).
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.
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