DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Haddow JE, Palomaki GE, Knight GJ.
Reducing the need for amniocentesis in woman 35 years of age or older with serum marker screening. 
N Engl J Med 1994; 330: 114-118  

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