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Impaired placental perfusion and major fetal cardiac defects.
Fantasia I, Andrade W, Syngelaki A, Akolekar R, Nicolaides KH.
Ultrasound Obstet Gynecol 2019;53:68-72. pdf -
Second-trimester levels of pregnancy-associated plasma protein-A and free beta-hCG in pregnancies with trisomy 13.
Spencer K, Crossley JA, Aitken DA, Nicolaides KH.
Prenat Diagn 2005;25:358-61.