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P. L. Noble, H. D. Abraha, R. J. M. Snijders, R. Sherwood and Professor K. H. Nicolaides Screening for fetal trisomy 21 in the first trimester of pregnancy: maternal serum free β-hCG and fetal nuchal translucency thickness Ultrasound in Obstetrics & Gynecology 6

Version of Record online: 22 JAN 2003 | DOI: 10.1046/j.1469-0705.1995.06060390.x

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