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Contributors JLNA and CJB conceived the idea. JLNA led development of the infographic and accompanying text. All authors contributed and approved the final infographic and accompanying text.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests CJB is a deputy editor and AGC is an associate editor of BJSM.
Provenance and peer review Not commissioned; externally peer reviewed.