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Maternal plasma cell-free fetal and maternal DNA at 11-13 weeks' gestation: relation to fetal and maternal characteristics and pregnancy outcomes.
Poon LC, Musci T, Song K, Syngelaki A, Nicolaides KH.
Fetal Diagn Ther 2013;33:215-23. pdf -
Association of placental volume measured by MRI and birth weight percentile.
Derwig IE, Akolekar R, Zelaya FO, Gowland PA, Barker GJ, Nicolaides KH.
J Magn Reson Imaging 2011;34:1125-30.