Maternal serum human chorionic gonadotrophin and pregnancy-associated plasma protein a, markers for fetal down syndrome at 8–14 weeks
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2000 ◽
Vol 107
(10)
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pp. 1265-1270
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1983 ◽
Vol 90
(4)
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pp. 323-325
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1995 ◽
Vol 10
(2)
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pp. 453-458
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