1. GENETICS AND PRENATAL DIAGNOSIS
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3. Maternal serum-alpha-fetoprotein measurement in antenatal screening for anencephaly and spina bifida in early pregnancy. Report of UK collaborative study on alpha-fetoprotein in relation to neural tube defects;Wald;Lancet,1977
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5. Unexplained elevations of maternal serum alpha-fetoprotein;Katz;Obstet Gynecol Surv,1990