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Contributors CH drafted the first version and JO'S contributed to the revisions. Both authors approved the final draft.
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 CH is supported by the NIHR School for Primary Care ResearchEvidence Synthesis Working group (NIHR SPCR ESWG project 390, the NIHR Oxford Biomedical Research Centre, Oxford University Hospitals NHS Foundation Trust, an NIHR Senior Investigator and Editor in Chief of BMJ Evidence-Based Medicine. JO'S is supported by an NIH postdoctoral research at Stanford University. He is an associate editor at BMJ EBM.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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