Genetic effects of family planning.
D002677:Chile; D002869:Chromosome Aberrations / Q000453:epidemiology*; D025063:Chromosome Disorders; D004314:Down Syndrome / Q000453:epidemiology; D005193:Family Planning Services; D005260:Female; D005828:Genetics, Population; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D012744:Sex Ratio