Prospective intervention trial of a screening protocol to identify fetal trisomy 18 using maternal serum alpha-fetoprotein, unconjugated oestriol, and human chorionic gonadotropin
1997 ◽
Vol 17
(5)
◽
pp. 487-490
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1996 ◽
Vol 16
(8)
◽
pp. 723-727
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1992 ◽
Vol 8
(6)
◽
pp. 341-341
2001 ◽
Vol 185
(6)
◽
pp. S223
1997 ◽
Vol 17
(11)
◽
pp. 1039-1046
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1996 ◽
Vol 5
(2)
◽
pp. 70-73
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1992 ◽
Vol 166
(1)
◽
pp. 355