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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 -
Cardiac defects in 1st-trimester fetuses with trisomy 18.
Hyett JA, Moscoso G, Nicolaides KH.
Fetal Diagn Ther 1995;10:381-6.