Size-resolved emission rates of airborne bacteria and fungi in an occupied classroom.

Indoor Air · 2012 · PMC3437488 · PMID 22257156

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may be significantno p-value reported

While the relative proportions of these mechanisms are unknown, there is evidence that both mechanisms may be significant.

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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.