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Uterine artery pulsatility index in the three trimesters of pregnancy: effects of maternal characteristics and medical history.
Tayyar A, Guerra L, Wright A, Wright D, Nicolaides KH.
Ultrasound Obstet Gynecol 2015;45:689-97. pdf -
Brachycephaly and frontal lobe hypoplasia in fetuses with trisomy 21 at 11 + 0 to 13 + 6 weeks.
Borenstein M, Dagklis T, Csapo B, Sotiriadis A, Nicolaides KH.
Ultrasound Obstet Gynecol 2006;28:870-5.