Dizygotic twinning rates and the possibility that the decline in sperm counts is a cohort phenomenon.
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James
D000328:Adult; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005060:Europe / Q000453:epidemiology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007248:Infertility, Male / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data*; D013076:Sperm Count; D014429:Twins, Dizygotic / Q000706:statistics & numerical data*