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Gyselaers, W.J.A., Vereecken, A.J., Van Herck, E.J.H., Straetmans, D.P.L., Martens, G.E.I., de Jonge, E.T.M., Ombelet, W.U.A.M. and Nijhuis, J.G. (2004) Screening for Trisomy 21 in Flanders: A 10 Years Review of 40.490 Pregnancies Screened by Maternal Serum. European Journal of Obstetrics & Gynecology and Reproductive Biology, 115, 185-189.
http://dx.doi.org/10.1016/j.ejogrb.2003.12.014

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