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Contributors BH conceived the idea for the letter and revised the structure, argument and content. GK wrote the original letter and revised the structure, argument and content.
Funding GK is supported by the Elizabeth Blackwell Institute for Health Research, University of Bristol and the Wellcome Trust Institutional Strategic Support Fund. BH is funded by a National Institute of Health Research Doctoral Fellowship.
Disclaimer The views expressed are those of the author and not necessarily those of the NHS, the NIHR or the Department of Health.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; internally peer reviewed.