DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Wright D, Abele H, Baker A et al.
Impact of bias in serum free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A multiples of the median levels on first-trimester screening for trisomy 21.
Ultrasound Obstet Gynecol 2011;
38: 309-313
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