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Fetal right ventricular contraction and relaxation times at 11-13 weeks' gestation by speckle tracking imaging.
Persico N, Fabietti I, Baffero G, Fedele L, Nicolaides KH.
Ultrasound Obstet Gynecol 2014;43:284-90. pdf -
Incidence of major structural cardiac defects associated with increased nuchal translucency but normal karyotype.
Ghi T, Huggon IC, Zosmer N, Nicolaides KH.
Ultrasound Obstet Gynecol 2001;18:610-4.