DOI:
10.1055/s-00000142
Frauenheilkunde up2date
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References
Kagan KO, Hoopmann M, Abele H et al.
First-trimester combined screening for trisomy 21 with different combinations of placental growth factor, free β-human chorionic gonadotropin and pregnancy-associated plasma protein-A.
Ultrasound Obstet Gynecol 2012;
40: 530-535
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