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Contributors GJR composed the first draft of the letter, after discussions with SW, NG and SKB. All authors reviewed the final document and agreed with its submission.
Funding This work was supported by the National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Emergency Preparedness and Response, a partnership between Public Health England, King’s College London and the University of East Anglia (grant number NIHR200890).
Disclaimer The views expressed are those of the author(s) and not necessarily those of the NIHR, Public Health England or the Department of Health and Social Care.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
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