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Screening for trisomy 21 in twin pregnancies by maternal age and fetal nuchal translucency thickness at 10-14 weeks of gestation.
Sebire NJ, Snijders RJM, Hughes K, Sepulveda W, Nicolaides KH.
BJOG 1996;103:999-1003. -
Fetal karyotyping in twin pregnancies: selection of technique by measurement of fetal nuchal translucency.
Sebire NJ, Noble PL, Psarra A, Papapanagiotou G, Nicolaides KH.
BJOG 1996;103:887-90.