Rule of 100: a litmus test for informationless diagnostic tests
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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.