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Rule of 100: a litmus test for informationless diagnostic tests

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Footnotes

  • Contributors AMW, DS, MBW and MTB all participated in planning the study, analysing the data and writing the manuscript. MBW submitted the study.

  • Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.