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Clinical significance of first-trimester chorionic bumps: a matched case-control study.
Sana Y, Appiah A, Davison A, Nicolaides KH, Johns J, Ross JA.
Ultrasound Obstet Gynecol 2013;42:585-9. -
Body Mass Index at 11-13 Weeks' Gestation and Pregnancy Complications.
Syngelaki A, Bredaki FE, Vaikousi E, Maiz N, Nicolaides KH.
Fetal Diagn Ther 2011;30:250-65.