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Second-trimester maternal serum screening for Down's syndrome: free beta-human chorionic gonadotrophin (HCG) and alpha-fetoprotein, with or without unconjugated oestriol, compared with total HCG, alpha-fetoprotein and unconjugated oestriol

Extermann, P. ; Bischof, P. ; Marguerat, P. ; Mermillod, B.

In: Human reproduction (Oxford, England), 1998, vol. 13, no. 1, p. 220-223