Epidemiological changes in mumps infections between 1990 and 2017 in urban area of Shanghai, China.

Hum Vaccin Immunother · 2021 · PMC8078658 · PMID 33175643

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a decreasing trendno p-value reported

After the introduction of MMR in 1996, the incidence had a decreasing trend in all age groups.

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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.