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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 -
Second-trimester screening for trisomy-21 using prefrontal space ratio.
Chaveeva P, Agathokleous M, Poon LC, Markova D, Nicolaides KH.
Fetal Diagn Ther 2013;34:50-5. pdf