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Umbilical cord diameter at 11-14 weeks of gestation: relation to chromosomal defects.
Rembouskos G, Cicero S, Papadopoulos V, Tripsanas C, Nicolaides KH.
Ultrasound Obstet Gynecol 2004;23:237-9. -
First trimester umbilical venous Doppler sonography in chromosomally normal and abnormal fetuses.
Brown RN, Di Luzio L, Gomes C, Nicolaides KH.
J Ultrasound Med 1999;18:543-6.