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Maternal serum vitamin D at 11-13 weeks in pregnancies delivering small for gestational age neonates.
Ertl R, Yu CK, Samaha R, Akolekar R, Nicolaides KH.
Fetal Diagn Ther 2012;31:103-8. -
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.