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Screening at 11-13+6 weeks' gestation.
Sonek JD, Nicolaides KH, Janku P.
Ceska Gynekol 2012;77:92-104. -
A mixture model of ductus venosus pulsatility index in screening for aneuploidies at 11-13 weeks' gestation.
Maiz N, Wright D, Ferreira AF, Syngelaki A, Nicolaides KH.
Fetal Diagn Ther 2012;31:221-9.