DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Wright D, Spencer K, Kagan KK et al.
First-trimester combined screening for trisomy 21 at 7–14 weeks’ gestation.

Ultrasound Obstet Gynecol 2010;
36: 404-411

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