Effect of a first responder on survival outcomes after out-of-hospital cardiac arrest occurs during a period of exercise in a public place.

PLoS One · 2018 · PMC5831003 · PMID 29489877

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may be significantno p-value reported

Thus, there potentially may be significant biases that were not controlled.

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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.