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Screening for trisomy 21 in monochorionic twins by measurement of fetal nuchal translucency thickness.
Vandecruys H, Faiola S, Auer M, Sebire N, Nicolaides KH.
Ultrasound Obstet Gynecol 2005;25:551-3. -
Sonographic measurement of cervical length in twin pregnancies in threatened preterm labor.
Fuchs I, Tsoi E, Henrich W, Dudenhausen JW, Nicolaides KH.
Ultrasound Obstet Gynecol 2004;23:42-5.