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Screening at 11-13+6 weeks' gestation.
Sonek JD, Nicolaides KH, Janku P.
Ceska Gynekol 2012;77:92-104. -
Temporal effect of Afro-Caribbean race on serum pregnancy-associated plasma protein-a at 9-13 weeks' gestation in screening for aneuploidies.
Ball S, Wright D, Sodre D, Lachmann R, Nicolaides KH.
Fetal Diagn Ther 2012;31:162-9.