DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Nadel AS, Bromley B, Frigoletto FDJ. et al.
Can the presumed risk of autosomal trisomy be decreased in fetuses of older women following a normal sonogram? 
J Ultrasound Med 1995; 14: 297-302  

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