DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Wright D, Spencer K, Kagan KK et al.
First-trimester combined screening for trisomy 21 at 7-14 weeksʼ gestation.
Ultrasound Obstet Gynecol 2010;
36: 404-411
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