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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 -
Sonographic markers of fetal aneuploidy: a review.
Cicero S, Sacchini C, Rembouskos G, Nicolaides KH.
Placenta 2003;24:S88-98.