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ESTIMATING A WOMANS RISK OF HAVING A PREGNANCY ASSOCIATED WITH DOWNS-SYNDROME USING HER AGE AND SERUM ALPHA-FETOPROTEIN LEVEL
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BRITISH JOURNAL OF OBSTETRICS AND GYNAECOLOGY,
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PLATT LD, 1988, 8TH ANN M LAS VEG
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PORTO M, 1988, 8TH ANN M LAS VEG
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SACKS AJ, 1988, 8TH ANN M LAS VEG