Association between allergic rhinitis and asthma control in Peruvian school children: a cross-sectional study.

Biomed Res Int · 2013 · PMC3741928 · PMID 23984414

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showed a trendno p-value reported

The International Study for Asthma and Allergy in Childhood in its third phase showed a trend of overall prevalence increase in several countries in the last decades.

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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.