Road traffic injury is an escalating burden in Africa and deserves proportionate research efforts.

PLoS Med · 2007 · PMC1896192 · PMID 17593893

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a decreasing trendno p-value reported

By contrast, developed countries have experienced a decreasing trend since the 1960s.

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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.