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Contributors JPC and AH drafted the initial version of this letter. All remaining authors (CW, KAB, FZ, TF) reviewed and revised the content and approved the final version.
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.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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