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Handling editor Ellen J Weber
Twitter @GovindOliver, @richardbody
Contributors This letter was conceived by CR and GO. The letter was drafted by GO, CR, RB and GPM. The final version was approved by all authors. All authors contributed their time free of charge; no funding was provided.
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.
Provenance and peer review Commissioned; internally peer reviewed.