DOI:
10.1055/s-00000142
Frauenheilkunde up2date
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References
Kagan KO, Staboulidou I, Cruz J. et al.
Two-stage first-trimester screening for trisomy 21 by ultrasound assessment and biochemical testing.
Ultrasound Obstet Gynecol 2010;
36: 542-547
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