DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Snijders RJM, Sundberg K, Holzgreve W et al.
Maternal age and gestation – specific risk for trisomy 21.
Ultrasound Obstet Gynecol 1999;
13: 167-170
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