DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Nyberg DA, Luthy DA, Resta RG. et al.
Age-adjusted ultrasound risk assessment for fetal Down’s syndrome during the second trimester: description of the method and analysis of 142 cases. 
Ultrasound Obstet Gynecol 1998; 12: 8-14  

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