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Nuchal translucency and other first-trimester sonographic markers of chromosomal abnormalities.
Nicolaides KH.
Am J Obstet Gynecol 2004;191:45-67. -
Screening for chromosomal abnormalities at 10-14 weeks: the role of ductus venosus blood flow.
Matias A, Gomes C, Flack N, Montenegro N, Nicolaides KH.
Ultrasound Obstet Gynecol 1998;12:380-4.