title: Down syndrome live births and prior spontaneous abortions of unknown karyotype.
authors.forename: E B
authors.initials: EB
authors.lastname: Hook
mesh_terms: D000022:Abortion, Spontaneous / Q000235:genetics*; D000328:Adult; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D007621:Karyotyping; D009518:New York; D011247:Pregnancy; D012306:Risk