DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Nicolaides KH, Spencer K, Avgidou K et al.
Multicenter study of first-trimester screening for trisomy 21 in 75 821 pregnancies: results and estimation of the potential impact of individual risk-orientated two-stage first-trimester screening.
Ultrasound Obstet Gynecol 2005;
25: 221-226
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