title: Hypothesis on the causes of the decline in dizygotic twinning rates.
mesh_terms: D000022:Abortion, Spontaneous / Q000453:epidemiology; D001723:Birth Rate; D005260:Female; D005298:Fertility; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D014427:Twins; D014429:Twins, Dizygotic