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Contributors KRM and CH oversaw the first draft and JA provided additional comments.
Funding All authors are supported by the BMJ Evidence Based Medicine journal in their roles as editors. KRM and CH are also supported by the National Institute for Health Research School for Primary Care Research Evidence Synthesis Working Group (project number 390).
Disclaimer The views expressed in this publication are those of the authors and not necessarily those of the host institutions, NIHR or the Department of Health and Social Care.
Competing interests KRM and CH report grants from the NIHR including the NIHR School of Primary Care Research Evidence Synthesis Working Group (project number 390). KRM and JA are associate editors of the BMJ EBM journal. CH is Editor in Chief of the BMJ EBM journal.
Provenance and peer review Commissioned; internally peer reviewed.
Patient consent for publication Not required.
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