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Evaluation of human chorionic gonadotropin beta-subunit mRNA concentrations in maternal serum in aneuploid pregnancies: A feasibility study.
Ng EK, El-Sheikhah A, Chiu RW, Chan KC, Hogg M, Bindra R, Leung TN, Lau TK, Nicolaides KH, Lo YM.
Clin Chem 2004;50:1055-7. -
First trimester maternal serum placenta growth factor (PlGF)concentrations in pregnancies with fetal trisomy 21 or trisomy 18.
Spencer K, Liao AW, Ong CY, Geerts L, Nicolaides KH.
Prenat Diagn 2001;21:718-22.