Importance of tear volume for positivity of tear matrix metalloproteinase-9 immunoassay.

PLoS One · 2020 · PMC7351366 · PMID 32649686

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may be significantno p-value reported

In addition, because classification according to the tear meniscus value is very artificial, there may be significant limitations based on whether the three groups are appropriate.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.