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Deceased Douglas G Altman’s deceased date: 3 June 2018
Contributors MAM, MN and DGA produced the first draft. GSC, RON, NPJ and MJC suggested revisions. All authors approved the final version.
Funding GSC was supported by the National Institute for Health Research Biomedical Research Centre, Oxford, and Cancer Research UK (programme grant: C49297/A27294).
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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