Fetal nasal bone and trisomy 21 in the second trimester
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2005 ◽
Vol 24
(11)
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pp. 1487-1489
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2005 ◽
Vol 192
(4)
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pp. 1107-1111
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2006 ◽
Vol 32
(4)
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pp. 403-407
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2003 ◽
Vol 21
(2)
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pp. 156-160
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