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Fetal and maternal hCG concentration in aneuploid pregnancies.
Abbas A, Chard T, Nicolaides KH.
Br J Obstet Gynaecol 1995;102:561-3. -
Maternal plasma concentrations of insulin-like growth factor binding protein-1 and placental protein 14 in multifetal pregnancies before and after fetal reduction.
Abbas A, Johnson M, Chard T, Nicolaides KH.
Hum Reprod 1995;10:207-10.