DOI: 10.1055/s-00000020

Geburtshilfe und Frauenheilkunde

References

Spencer K.
Age related detection and false positive rates when screening for Down's syndrome in the first trimester using fetal nuchal translucency and maternal serum free beta-hCG and PAPP-A. 
Br J Obstet Gynaecol 2001; 108: 1043-1046  

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