Cost-effectiveness of adolescent pertussis vaccination for the Netherlands: using an individual-based dynamic model.

PLoS One · 2010 · PMC2955521 · PMID 20976213

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an increasing trendno p-value reported

However, during the past decade the incidence has again shown an increasing trend in many developed countries with a shift in the incidence towards older age groups [1] .

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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.