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British Medical Journal|April 14, 1979
Precision in estimating gestational age and its influence on sensitivity of alphafetoprotein screeningC J Roberts, B M Hibbard, D R Evans, et al.Lancet (London, England)|June 11, 1983
The efficacy of a serum screening service for neural-tube defects: the South Wales experienceC J Roberts, B M Hibbard, G H Elder, et al.Pageof 4