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Maternal serum alpha-fetoprotein in fetal neural tube and abdominal wall defects at 10-14 weeks of gestation.
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BJOG 1997;104:849-51. -
First trimester maternal serum alpha-fetoprotein in fetal trisomies.
Brizot ML, Khun P, Bersinger NA, Snijders RJM, Nicolaides KH.
Br J Obstet Gynaecol 1995;102:31-4.