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R. J. M. Snijders, K. Sundberg, W. Holzgreve, G. Henry and Professor K. H. Nicolaides Maternal age- and gestation-specific risk for trisomy 21 Ultrasound in Obstetrics & Gynecology 13

Version of Record online: 23 DEC 2002 | DOI: 10.1046/j.1469-0705.1999.13030167.x

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