Maternal vitamin D status and infant outcomes in rural Vietnam: a prospective cohort study.

PLoS One · 2014 · PMC4072587 · PMID 24967813

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showed a trendno p-value reported

We found increasing maternal vitamin D concentration showed a trend towards a reduced risk of preterm delivery.

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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.