Effects of mechanical ventilation and portable air cleaner on aerosol removal from dental treatment rooms.

J Dent · 2021 · PMC7834919 · PMID 33388387

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may be significantno p-value reported

This level of increase may be significant if the background noise level is already high.

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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.