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Placental expression of alpha and beta subunits of human chorionic gonadotrophin in early pregnancies with Down's syndrome.
Brizot ML, Jauniaux E, Mckie AT, Farzaneh F, Nicolaides KH.
Hum Reprod 1995;10:2506-9. -
Fetal and maternal hCG concentration in aneuploid pregnancies.
Abbas A, Chard T, Nicolaides KH.
Br J Obstet Gynaecol 1995;102:561-3.