DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Biagiotti R, Brizzi L, Periti E, d'Agata A, Vanzi E, Cariati E.
First trimester screening for Down's syndrome using maternal serum PAPP-A and free beta-hCG in combination with fetal nuchal translucency thickness.
Br J Obstet Gynaecol 1998;
105 (08) 917-920 . Doi: 10.1111/j.1471-0528.1998.tb10239.x
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