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Abbas, Anthony; Sebire, Neil J.; Johnson, Mark; Bersinger, Nicholas; Nicolaides, Kypros H. (1996). Maternal serum concentrations of pregnancy associated placental protein A and pregnancy specific β-1-glycoprotein in multifetal pregnancies before and after fetal reduction. Human reproduction, 11(4), pp. 900-902. Oxford University Press 10.1093/oxfordjournals.humrep.a019275
