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Contributors HMR and KL made a joint decision to write this piece. HMR led on the preparation of the article, but otherwise the writing and revisions were jointly done and we are jointly responsible for the overall content.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Disclaimer This is an independent (unfunded) think piece and the views expressed are not necessarily those of UCL Great Ormond Street Institute of Child Health, the University of Exeter, or their funders.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
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