American Journal of Obstetrics and Gynecology · 2001 · 19 citations · 13 references
Down SyndromeEarly DiagnosisPediatricsGynecologyMaternal HealthDiagnosisAdvanced Maternal AgePrenatal DiagnosisIntrapartum UltrasoundPrenatal ScreeningUltrasoundMedicinePrenatal TestingDown Syndrome Screening
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Maternal serum screening for Down's syndrome in early pregnancy.
N J Wald, Howard Cuckle, J. W. Densem et al. · BMJ · 1988 · 974 citations · Full text
Four‐marker serum screening for Down's syndrome
Nicholas Wald, J. W. Densem, David J. Smith et al. · Prenatal Diagnosis · 1994 · 126 citations