First trimester prenatal screening in multiple pregnancies. Part I: comparative analysis of serum proteins PAPP-A and p-hCG in pregnancies conceived spontaneously or by in vitro fe... by V. I. Tsibizova, I. E. Govorov, T. М. Pervunina, E. V. Komlichenko, E. K. Kudryashova, D. V. Blinov, A. D. Makatsariya, G. C. Di Renzo

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