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Is there an association between maternal ABO and rhesus blood groups and the first-trimester serum markers free β-hCG and PAPP-A used for the detection of fetal aneuploidy?
Authors:Nicholas J. Cowans  Kevin Spencer
Affiliation:Prenatal Screening Unit, Department of Clinical Biochemistry, Harold Wood Hospital, Romford, Essex RM3 0BE
Abstract:
Keywords:prenatal screening  trisomy 21  Down syndrome
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