DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Nicolaides KH, Wright D, Poon LC. et al.
First-trimester contingent screening for trisomy 21 by biomarkers and maternal blood cell-free DNA testing.
Ultrasound Obstet Gynecol 2013;
42: 41-50
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