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First-trimester markers of aneuploidy in women positive for HIV.
Savvidou M, Samuel I, Syngelaki A, Poulton M, Nicolaides K.
BJOG 2011;118:844-8. -
Dose dependency between cigarette consumption and reduced maternal serum PAPP-A levels at 11-13(+6) weeks of gestation.
Kagan KO, Frisova V, Nicolaides KH, Spencer K.
Prenat Diagn 2007;27:849-53.