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Oxford University Press

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Pregnancies conceived using assisted reproductive technologies (ART) have low levels of pregnancy-associated plasma protein-A (PAPP-A) leading to a high rate of false-positive results in first trimester screening for Down syndrome

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The effect of a vanishing twin on biochemical and ultrasound first trimester screening markers for Down's syndrome in pregnancies conceived by assisted reproductive technology

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First trimester biochemical screening for Down's syndrome in singleton pregnancies conceived by assisted reproduction

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