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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 -
Fetal cells in maternal blood of pregnancies with severe fetal growth restriction.
Al-Mufti R, Lees C, Albaiges G, Hambley H, Nicolaides KH.
Hum Reprod 2000;15:218-21.