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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. -
Cardiac defects in chromosomally normal fetuses with abnormal ductus venosus blood flow at 10-14 weeks.
Matias A, Huggon I, Areias JC, Montenegro N, Nicolaides KH.
Ultrasound Obstet Gynecol 1999;14:307-10.