Re: "Estimates of the annual number of clinically recognized pregnancies in the United States, 1981-1991".
Goldhaber
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MK
Fireman
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D000022:Abortion, Spontaneous / Q000453:epidemiology*; D000328:Adult; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D015994:Incidence; D008423:Maternal Age; D011247:Pregnancy / Q000706:statistics & numerical data*; D011256:Pregnancy Outcome / Q000453:epidemiology; D014481:United States / Q000453:epidemiology