Identifying regional variation in the prevalence of postpartum haemorrhage: a systematic review and meta-analysis.

PLoS One · 2012 · PMC3402540 · PMID 22844432

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an increasing trendno p-value reported

found evidence for an increasing trend in PPH in Australia, Canada, the UK and the USA between 1991 and 2006 [28] .

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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.