Advances in COVID-19 research until November 2020: Update from the UNCOVER registry.

J Glob Health · 2021 · PMC7897429 · PMID 33643632

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an increasing trendno p-value reported

There has been an increasing trend in the number of published or ongoing COVID-19 reviews and the composition of research topics has changed over time.

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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.