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6. First-trimester screening for trisomy 21 by free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A: impact of maternal and pregnancy characteristics. Kagan KO; Wright D; Spencer K; Molina FS; Nicolaides KH Ultrasound Obstet Gynecol; 2008 May; 31(5):493-502. PubMed ID: 18432600 [TBL] [Abstract][Full Text] [Related]
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