The impact of routine open nonsuction drainage on fluid accumulation after thyroid surgery: a prospective randomised clinical trial.

World J Surg Oncol · 2012 · PMC3407716 · PMID 22540955

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showed a trendno p-value reported

Drains themselves showed a trend indicating that they may augment infection rates.

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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.