A systematic review on the development of asthma and allergic diseases in relation to international immigration: the leading role of the environment confirmed.

PLoS One · 2014 · PMC4139367 · PMID 25141011

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showed a trendno p-value reported

This association has been demonstrated for various immigrant groups in Europe, the US, Australia and Israel, and none of the studies have showed a trend in the opposite direction.

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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.