Cardiovascular disease occurrence in two close but different social environments.

Int J Health Geogr · 2011 · PMC3025825 · PMID 21226912

Europe PMC DOI

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a clear trendno p-value reported

In many industrial countries here is a clear trend of widening social class differences.

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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.