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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 -
Maternal endothelial function and serum concentrations of placental growth factor and soluble endoglin in women with abnormal placentation.
Savvidou MD, Noori M, Anderson JM, Hingorani AD, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;32:871-6.