DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

Referenz

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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