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Fetal head-to-trunk volume ratio in chromosomally abnormal fetuses at 11 + 0 to 13 + 6 weeks of gestation.
Falcon O, Cavoretto P, Peralta CF, Csapo B, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;26:755-60. -
Crown-rump length in chromosomally abnormal fetuses at 10 to 13 weeks' gestation.
Kuhn P, Brizot ML, Pandya PP, Snijders RJ, Nicolaides KH.
Am J Obstet Gynecol 1995;172:32-5.