DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Cuckle HS, Wald NJ, Thompson SG.
Estimating a woman’s risk of having a pregnancy associated with Down’s syndrome using her age and serum alpha-fetoprotein level. 
Br J Obstet Gynaecol 1987; 94: 387-402  

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