Monitoring blood flow responses during topical ALA-PDT.

Biomed Opt Express · 2010 · PMC3028487 · PMID 21326642

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a clear trendno p-value reported

The ongoing clinical trial and collection of data generating statistically significant data sets may show a clear trend in blood flow responses.

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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.