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The mitral gap at 11 + 0 to 13 + 6 weeks: marker of trisomy 21 or artifact?
Maiz N, Dagklis T, Huggon I, Allan L, Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:813-8. -
Placental volume measured by three-dimensional ultrasound at 11 to 13 + 6 weeks of gestation: relation to chromosomal defects.
Wegrzyn P, Faro C, Falcon O, Peralta CF, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;26:28-32.