title: Fertility and longevity in twins, sibs, and parents of twins.
mesh_terms: D005190:Family; D005260:Female; D005298:Fertility; D006801:Humans; D008136:Longevity; D008297:Male; D008428:Maternal Mortality; D010290:Parents; D011247:Pregnancy; D014171:Transients and Migrants; D014427:Twins