DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Snijders RJ, 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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