Temporal trends and predictors of perfluoroalkyl substances serum levels in Swedish pregnant women in the SELMA study.

PLoS One · 2018 · PMC6312341 · PMID 30596681

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a decreasing trendno p-value reported

an increasing trendno p-value reported

Even though our data of PFNA is showing a decreasing trend during the sampling years, several other studies have reported an increasing trend [ 17 , 22 ].

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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.