DOI:
10.1055/s-00000142
Frauenheilkunde up2date
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References
Kagan KO, Wright D, Spencer K. et al.
First-trimester screening for trisomy 21 by free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A: impact of maternal and pregnancy characteristics.
Ultrasound Obstet Gynecol 2008;
31: 493-502
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