Prospective study evaluating performance of first-trimester combined screening for trisomy 21 using repeat sampling of maternal serum markers PAPP-A and free β-hCG
C Ekelund, D Wright, S Ball, I Kirkegaard, P Nørgaard, S Sørensen, L Friis-Hansen, F S Jørgensen, Niels Tørring, B H Bech, O B Petersen, A Tabor
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(Scopus)
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