(Q47337052)
Statements
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Analysis of maternal serum alpha-fetoprotein and free beta human chorionic gonadotrophin in the first trimester: implications for Down's syndrome screening (English)
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Berry E
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Aitken DA
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Crossley JA
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Macri JN
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Connor JM
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1 June 1995
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15
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6
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555-565
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