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Placental volume in twin and triplet pregnancies measured by three-dimensional ultrasound at 11 + 0 to 13 + 6 weeks of gestation.
Wegrzyn P, Fabio C, Peralta A, Faro C, Borenstein M, Nicolaides KH.
Ultrasound Obstet Gynecol 2006;27:647-51. -
Femur and humerus length in trisomy 21 fetuses at 11-14 weeks of gestation.
Longo D, DeFigueiredo D, Cicero S, Sacchini C, Nicolaides KH.
Ultrasound Obstet Gynecol 2004;23:143-7.