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Cervical length at 23 weeks in twins in predicting spontaneous preterm delivery.
Souka AP, Heath V, Flint S, Sevastopoulou I, Nicolaides KH.
Obstet Gynecol 1999;94:450-4. -
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.