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? |
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Authors: | Nicholas J. Cowans Kevin Spencer |
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Affiliation: | Prenatal Screening Unit, Department of Clinical Biochemistry, Harold Wood Hospital, Romford, Essex RM3 0BE |
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Abstract: | |
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Keywords: | prenatal screening trisomy 21 Down syndrome |
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