Tonsillectomy and the risk for deep neck infection-a nationwide cohort study.

PLoS One · 2015 · PMC4388732 · PMID 25849535

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an increasing trendno p-value reported

The latter group had an increasing trend for developing DNI, although not statistically 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.