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Sonographic markers of aneuploidies at 6-10 weeks of gestation.
Papaioannou GK, Syngelaki A, Maiz N, Ross JA, Nicolaides KH.
Early Hum Dev 2011;87:453-6. -
Gestational sac volume measured by three-dimensional ultrasound at 11 to 13 + 6 weeks of gestation: relation to chromosomal defects.
Falcon O, Wegrzyn P, Faro C, Peralta CF, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;25:546-50.