The effectiveness of Korean medicine treatment in male patients with infertility: a study protocol for a prospective observational pilot study.

Medicine (Baltimore) · 2018 · PMC5794379 · PMID 29369195

Europe PMC DOI

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a decreasing trendno p-value reported

[ 22 ] A similar decline has been found in young Chinese men, whose semen parameters showed a decreasing trend over a 15-year observational period.

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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.