Prevalence of allergic diseases among Korean school-age children: a nationwide cross-sectional questionnaire study.

J Korean Med Sci · 2011 · PMC3051078 · PMID 21394299

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an increasing trendno p-value reported

According to the ISAAC Phases One and Three repeat multi-country cross-sectional surveys, the prevalence of asthma showed an increasing trend worldwide ( 19 ).

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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.