Maternal serum alphfetoprotein in pregnancy and the prevention of birth defect
BMJ: British Medical Journal 1980 May 17; 280(6225): 1199-1202
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Smithells RW; Nevin NC; Seller MJ; Sheppard S; Harris R; Read AP; Fielding DW; Walker S; Schorah CJ; Wild J. (1983-05-07)