Impact of bias in serum free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A multiples of the median levels on first-trimester screening for trisomy 21

First-trimester combined screening for trisomy 21 at 7-14 weeks' gestation

(2010) D. Wright et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

Effect of temperature on free β-human chorionic gonadotropin and pregnancy-associated plasma protein-A concentration

(2010) J. Cruz et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

Effect of deviation of nuchal translucency measurements on the performance of screening for trisomy 21

(2009) K. O. Kagan et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

The impact of crown-rump length measurement error on combined Down syndrome screening: a simulation study

(2009) L. J. Salomon et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

Prospective validation of first-trimester combined screening for trisomy 21

(2009) K. O. Kagan et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

A mixture model of nuchal translucency thickness in screening for chromosomal defects

(2008) D. Wright et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

First-trimester screening for trisomy 21 by free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A: impact of maternal and pregnancy characteristics

(2008) K. O. Kagan et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY

Screening for trisomy 21 by maternal age, fetal nuchal translucency thickness, free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A

(2008) K. O. Kagan et al.   ULTRASOUND IN OBSTETRICS & GYNECOLOGY