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First trimester maternal uterine artery Doppler examination in HIV-positive women.
Savvidou M, Samuel M, Akolekar R, Poulton M, Nicolaides K.
HIV Med 2011;12:632-6. -
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.