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Expanded conventional first trimester screening.
Carmichael JB, Liu HP, Janik D, Hallahan TW, Nicolaides KH, Krantz DA.
Prenat Diagn 2017;37:802-807. pdf -
First-trimester contingent screening for trisomy 21 by biomarkers and maternal blood cell-free DNA testing.
Nicolaides KH, Wright D, Poon LC, Syngelaki A, Gil MM.
Ultrasound Obstet Gynecol 2013;42:41-50. pdf -
First-Trimester Screening for Trisomy 21 Using Alpha-Fetoprotein.
Bredaki FE, Wright D, Matos P, Syngelaki A, Nicolaides KH.
Fetal Diagn Ther 2011;30:215-8.