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Contributors AP and IO conceived and wrote this paper.
Funding AP reports grants from NIHR (Programme grants for applied research RP-PG-1210-12003), grants from NIHR School of Primary Care Research (NIHR Evidence Synthesis working group Project No: 390) and occasionally receives expenses for teaching Evidence-Based Medicine. IJO holds grant funding from the NIHR School of Primary Care Research (NIHR Evidence Synthesis working group Project No: 390).
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.
Patient consent for publication Not required.
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