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Contributors MC and XA drafted the first version of the letter.
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 XA is a member of the steering committee of the Mitra-Fr Study, and reports consultancy work undertaken for WL Gore (no personal fees received).
Provenance and peer review Commissioned; internally peer reviewed.
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