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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 -
Liver volume in trisomy 21 and euploid fetuses at 11 to 13 weeks.
Gielchinsky Y, Zvanca M, Minekawa R, Persico N, Nicolaides KH.
Prenat Diagn 2011;31:28-32.