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Prenatal diagnosis of trisomy 18 at the 10-14-week ultrasound scan.
Sherod C, Sebire NJ, Soares W, Snijders RJ, Nicolaides KH.
Ultrasound Obstet Gynecol 1997;10:387-90. -
Crown-chin length in normal and anencephalic fetuses at 10-14 weeks gestation.
Sepulveda W, Sebire NJ, Fung TY, Pipi E, Nicolaides KH.
Am J Obstet Gynecol 1997;176:852-5.