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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 -
Crown-chin length in normal and anencephalic fetuses at 10-14 weeks gestation.
Sepulveda W, Sebire NJ, Fung TY, Pipi E, Nicolaides KH.
Am J Obstet Gynecol 1997;176:852-5.