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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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N Wald et al BMJ (1992) 305, 6850, 391-4.

Sheldon, T. Appraisal of a new scheme for prenatal screening for Down's syndrome (1991). BMJ, 302 (6785), 1133-6.

Riggs JW (1996). Review: pregnant women can be offered screening for the Down syndrome. EBM, 1 (5), 151.

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