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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. -
Increased nuchal translucency with normal karyotype.
Souka AP, Von Kaisenberg CS, Hyett JA, Sonek JD, Nicolaides KH.
Am J Obstet Gynecol 2005;192:1005-21.