DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Kagan KO, Wright D, Baker A, Sahota D, Nicolaides KH.
Screening for trisomy 21 by maternal age, fetal nuchal translucency thickness, free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A.
Ultrasound Obstet Gynecol 2008;
31 (06) 618-624 . Doi: 10.1002/uog.5331
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