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First-trimester screening for neural tube defects using alpha-fetoprotein.
Bredaki FE, Poon LC, Birdir C, Escalante D, Nicolaides KH.
Fetal Diagn Ther 2012;31:109-14. -
First-trimester maternal serum matrix metalloproteinase-9 (MMP-9) and adverse pregnancy outcome.
Poon LC, Nekrasova E, Anastassopoulos P, Livanos P, Nicolaides KH.
Prenat Diagn 2009;29:553-9.