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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 -
Brachycephaly and frontal lobe hypoplasia in fetuses with trisomy 21 at 11 + 0 to 13 + 6 weeks.
Borenstein M, Dagklis T, Csapo B, Sotiriadis A, Nicolaides KH.
Ultrasound Obstet Gynecol 2006;28:870-5.