DOI:
10.1055/s-00000142
Frauenheilkunde up2date
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References
Agathokleous M, Chaveeva P, Poon LC. et al.
Meta-analysis of second-trimester markers for trisomy 21.
Ultrasound Obstet Gynecol 2013;
41: 247-261
doi:10.1002/uog.12364
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