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First trimester aneuploidy screening in the presence of a vanishing twin: implications for maternal serum markers.
Spencer K, Staboulidou I, Nicolaides KH.
Prenat Diagn 2010;30:235-40. -
Ductus venosus in the first trimester: contribution to screening of chromosomal, cardiac defects and monochorionic twin complications.
Maiz N, Nicolaides KH.
Fetal Diagn Ther 2010;28:65-71.