Duration of labor and the risk of severe postpartum hemorrhage: A case-control study.

PLoS One · 2017 · PMC5383278 · PMID 28384337

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an increasing trendno p-value reported

Recent studies have shown an increasing trend in PPH, but the causes for this increase are still uncertain [ 2 – 4 ].

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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.