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Contributors RA contributed to the conception, design, initial draftmaking and revision. RP contributed to the draft conception, design and revision. AW, CLA and JE-M participated in the conception, development, drafting and revision of the final manuscript. All authors approved the final version of the manuscript. CLA is a BJSM deputy editor responsible for systematic reviews, AW is a BJSM deputy editor responsible for member associations and consensus statements and RA is a BJSM associate editor.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Correction notice This paper has been amended since it was published Online First. Citation 3 at the very end of the paper has been removed.