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Snijders, R.J.M., Sundberg, K., Holzgreve, W., Henry, G. and Nicolaides, K.H. (1999) Maternal age and gestation-specific risk for trisomy 21. Ultrasound Obstetrics and Gynecology, 14, 167-170. doi:10.1046/j.1469-0705.1999.13030167.x

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