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Increased nuchal translucency in trisomy 13 fetuses at 10-14 weeks of gestation.
Snijders RJ, Sebire NJ, Nayar R, Souka A, Nicolaides KH.
Am J Med Genet 1999;86:205-7. -
First-trimester determination of fetal gender by ultrasound.
Efrat Z, Akinfenwa Y, Nicolaides KH.
Ultrasound Obstet Gynecol 1999;13:305-7.