DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Spencer K, Kagan KO, Nicolaides KH.
Screening for trisomy 21 in twin pregnancies in the first trimester: an update of the impact of chorionicity on maternal serum markers.
Prenat Diagn 2008;
28: 49-52
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