Temporal trends in sperm count: a systematic review and meta-regression analysis Abstract, “This comprehensive meta-regression analysis reports a significant decline in sperm counts (as measured by SC and TSC) between 1973 and 2011, driven by a 50–60% decline among men unselected by fertility from North America, Europe, Australia and New Zealand. Because of the significant public health implications of these results, research on the causes of this continuing decline is urgently needed.” https://academic.oup.com/humupd/artic…
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