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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 -
Maternal serum retinol-binding protein-4 at 11-13weeks' gestation in normal and pathological pregnancies.
Nanda S, Nikoletakis G, Markova D, Poon LC, Nicolaides KH.
Metabolism 2013;62:814-9.