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Contributors JOS conceived the ideas and wrote the article. It is entirely his work.
Funding My DPhil (PhD) is funded by the Clarendon Fund, University of Oxford.
Competing interests I receive income from Oxford University Hospitals for clinical work and hold grants from the National Institute for Health Research and the Primary Care Research Trust. My views are entirely mine and do not represent any of my employers.
Provenance and peer review Commissioned; internally peer reviewed.
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