DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Kagan KO, Etchegaray A, Zhou Y et al.
Prospective validation of first-trimester combined screening for trisomy 21.
Ultrasound Obstet Gynecol 2009;
34: 14-18
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