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First-trimester contingent screening for trisomies 21, 18 and 13 by fetal nuchal translucency and ductus venosus flow and maternal blood cell-free DNA testing.
Kagan KO, Wright D, Nicolaides KH.
Ultrasound Obstet Gynecol 2015;45:42-7. pdf -
Sonographic markers of fetal aneuploidy: a review.
Cicero S, Sacchini C, Rembouskos G, Nicolaides KH.
Placenta 2003;24:S88-98.