DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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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.
BJOG 2001; 108: 1043-1046
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