P31.02: Diagnosis of trisomy 21 in a referral center: does first trimester screening improve the detection at an earlier gestational age?
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1997 ◽
Vol 9
(4)
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pp. 248-252
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2010 ◽
Vol 36
(5)
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pp. 542-547
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2004 ◽
Vol 104
(4)
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pp. 661-666
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2005 ◽
Vol 192
(4)
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pp. 1107-1111
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