OP04.01: Impact of a level shift downward in measurement of PAPP-A concentration on the screening performance of first-trimester screening for Down syndrome
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2004 ◽
Vol 191
(6)
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pp. S176
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2004 ◽
Vol 44
(3)
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pp. 205-209
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2016 ◽
Vol 71
(5)
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pp. 277-279
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2009 ◽
Vol 33
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pp. 518-523
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