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Ductus venosus Doppler at 11 to 13 weeks of gestation in the prediction of outcome in twin pregnancies.
Maiz N, Staboulidou I, Leal AM, Minekawa R, Nicolaides KH.
Obstet Gynecol 2009;113:860-5. -
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.