Ginkgo biloba for the treatment of vitilgo vulgaris: an open label pilot clinical trial.

BMC Complement Altern Med · 2011 · PMC3065445 · PMID 21406109

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a decreasing trendno p-value reported

The PTT showed a decreasing trend toward normalization by the end of the study.

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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.