Qualitative environmental health research: an analysis of the literature, 1991-2008.

Environ Health Perspect · 2010 · PMC2920087 · PMID 20421191

Europe PMC DOI

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an overall trendno p-value reported

There appears to be an overall trend in the number of articles published per year ( Figure 1 ), with noticeable spikes in 2001 and 2006.

also in 4,871 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.