175: Combined first trimester screening for Down syndrome with nasal bone (NB) is cost advantageous over NIPS in younger advanced maternal age (AMA) patients
2014 ◽
Vol 210
(1)
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pp. S99
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2010 ◽
Vol 32
(03)
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pp. 302-306
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2004 ◽
Vol 44
(3)
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pp. 205-209
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2008 ◽
Vol 199
(6)
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pp. S194
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2015 ◽
Vol 56
(06)
◽
pp. 359-359
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2018 ◽
Vol 57
(4)
◽
pp. 536-540
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