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Assisted conception and placental perfusion assessed by uterine artery Doppler at 11-13 weeks' gestation.
Carbone IF, Cruz JJ, Sarquis R, Akolekar R, Nicolaides KH.
Hum Reprod 2011;26:1659-64. -
Frontomaxillary facial angle in fetuses with spina bifida at 11-13 weeks.
Lachmann R, Picciarelli G, Moratalla J, Green N, Nicolaides KH.
Ultrasound Obstet Gynecol 2010;36:268-71.