DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Vintzileos A, Guzman E, Smulian J. et al
Second-Trimester Genetic Sonography in Patients With Advanced Maternal Age and Normal Triple Screen. 
Obstet Gynecol 2002; 99: 993-995  

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