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Cervical length at 23 weeks of gestation: relation to demographic characteristics and previous obstetric history.
Heath VC, Southall TR, Souka AP, Novakov A, Nicolaides KH.
Ultrasound Obstet Gynecol 1998;12:304-11. -
Nuchal translucency thickness and crown-rump length in twin pregnancies with chromosomally abnormal fetuses.
Pandya PP, Hilbert F, Snijders RJM, Nicolaides KH.
J Ultrasound Med 1995;14:565-8. -
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.