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Lancet (London, England)|November 5, 1983
Diagnostic effectiveness of ultrasound in detection of neural tube defect. The South Wales experience of 2509 scans (1977-1982) in high-risk mothersC J Roberts, K T Evans, B M Hibbard, et al.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.Teratology|November 1, 1991
Heterogeneity of neural tube defects in Europe: the significance of site of defect and presence of other major anomalies in relation to geographic differences in prevalenceH Dolk, P De Wals, Y Gillerot, 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.Prenatal Diagnosis|February 1, 1990
Maternal serum alpha-fetoprotein screening for open neural tube defects in twin pregnanciesH Cuckle, N Wald, J D Stevenson, et al.Pageof 7