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Quality appraisal of evidence generated during a crisis: in defence of ‘timeliness’ and ‘clarity’ as criteria

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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.