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Contributors SEK drafted the letter. PA, JC and MCD provided comments and edited the draft. All authors agreed the final submission.
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 SEK is chair of the UK’s MODREC. JC is a vice-chair of MODREC. PA and MCD are members of MODREC.
Provenance and peer review Not commissioned; internally peer reviewed.