A systematic review of research on the meaning, ethics and practices of authorship across scholarly disciplines.

PLoS One · 2011 · PMC3169533 · PMID 21931600

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an increasing trendno p-value reported

Editors considered that there was an increasing trend of ghost authorship, but did not perceive it as a severe problem in their work [113] .

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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.