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GSB and TH are joint first authors.
Twitter @DRGSBullock, @dt_hughes
Correction notice This article has been corrected since it published Online First. The author affiliations have been corrected.
Contributors GSB, TH, JCS, MJC, RR and GC conceived the study idea. GSB, TH, JCS, MJC, RR and GSC were involved in design and planning. GSB, TH, RR and GC wrote the first draft of the manuscript. GSB, TH, JCS, MJC, RR and GC critically revised the manuscript. GSB, TH, JCS, MJC, RR and GC approved the final version of the manuscript.
Funding GSC was supported by the NIHR Biomedical Research Centre, Oxford, and Cancer Research UK (programme grant: C49297/A27294).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.