Gestation dependant changes in angiogenic factors and their associations with fetal growth measures in normotensive pregnancy.

PLoS One · 2013 · PMC3542273 · PMID 23326589

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an increasing trendno p-value reported

In our study there was an increasing trend in maternal plasma VEGF levels from first time point (16–20 weeks) to second time point (26–30 weeks).

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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.