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Contributors KRM drafted the manuscript. DN and CH contributed substantially to further revisions of the manuscript, and all authors approved the final version.
Disclaimer The views expressed are those of the author(s) and not necessarily those of the National Health Service, the National Institute for Health Research or the Department of Health.
Competing interests KRM is an NIHR-funded clinical lecturer in general practice, UK.
Provenance and peer review Commissioned; externally peer reviewed.
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