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K. O. Kagan, D. Wright, K. Spencer, F. S. Molina and K. H. Nicolaides First-trimester screening for trisomy 21 by free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A: impact of maternal and pregnancy characteristics Ultrasound in Obstetrics & Gynecology 31

Article first published online: 23 APR 2008 | DOI: 10.1002/uog.5332

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