Prevalence of non-syndromic orofacial clefts: based on 15,094,978 Chinese perinatal infants.

Oncotarget · 2018 · PMC5862631 · PMID 29568410

Europe PMC DOI

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The sentences

a decreasing trendno p-value reported

Although the results were not significantly different, it seems that there is a decreasing trend of prevalence with time.

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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.