Global historical retrospect and future prospects on biomarkers of heart failure: A bibliometric analysis and science mapping.

Heliyon · 2023 · PMC9942007 · PMID 36825183

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a decreasing trendno p-value reported

Although the total number of themes continued to increase over the four periods, the overlapping of themes increased further and the innovation index showed a decreasing trend.

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an increasing trendno p-value reported

Studies on HF biomarkers began to trickle in around the 1990s, with no more than 10 documents published between 1989 and 1996 yet an increasing trend.

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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.