title: Relevance of the marriages of twins to the causal analysis of nonrandom mating.
mesh_terms: D000328:Adult; D005260:Female; D005824:Genetics, Behavioral; D006801:Humans; D008297:Male; D008393:Marriage; D008433:Mathematics; D008957:Models, Genetic; D011247:Pregnancy; D012725:Sexual Behavior; D013223:Statistics as Topic; D014427:Twins; D014430:Twins, Monozygotic