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First-trimester combined screening for trisomy 21 at 8-13 weeks.
Wright D, Spencer K, Kagan K, Tørring N, Petersen O, Christou A, Kallikas J, Nicolaides K.
Ultrasound Obstet Gynecol 2010;36:404-11. -
Two-stage first-trimester screening for trisomy 21 by ultrasound assessment and biochemical testing.
Kagan K, Staboulidou I, Cruz JJ, Wright D, Nicolaides K.
Ultrasound Obstet Gynecol 2010;36:542-7. -
Screening for trisomy 21 in twin pregnancies in the first trimester: an update of the impact of chorionicity on maternal serum markers.
Spencer K, Kagan KO, Nicolaides KH.
Prenat Diagn 2008;28:49-52. -
Screening for trisomy 21 by maternal age, fetal nuchal translucency thickness, free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A.
Kagan KO, Wright D, Baker A, Sahota D, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;31:618-24. -
First-trimester screening for trisomy 21 by free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A: impact of maternal and pregnancy characteristics.
Kagan KO, Wright D, Spencer K, Molina FS, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;31:493-50.