Prevalence of placenta previa among deliveries in Mainland China: A PRISMA-compliant systematic review and meta-analysis.

Medicine (Baltimore) · 2016 · PMC5059095 · PMID 27749592

Europe PMC DOI

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an obvious trendno p-value reported

Unfortunately, the map only provides information for 25 provincial regions, 6 provinces without data, and we could not find an obvious trend in the geographic distribution of placenta previa.

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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.