Global scientific collaboration in COPD research.

Int J Chron Obstruct Pulmon Dis · 2017 · PMC5230730 · PMID 28123294

Europe PMC DOI

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an increasing trendno p-value reported

As a whole, the amount of subject categories refers to the COPD research that has witnessed an increasing trend from 78 in 1998 to 128 in 2015.

also in 63,971 other papers

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.