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Screening for trisomy 21 in monochorionic twins by measurement of fetal nuchal translucency thickness.
Vandecruys H, Faiola S, Auer M, Sebire N, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;25:551-3. -
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.