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Contributors AP is the sole author.
Funding The author has not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests AP reports grants from NIHR School of Primary Care Research Evidence Synthesis Working Group (NIHR SPCR ESWG project 390), and occasionally receives expenses for teaching evidence-based medicine. AP is an associate editor of BMJ EBM.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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