DOI: 10.1055/s-00030576

Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics

References

Engels MA, Heijboer AC, Blankenstein MA, van Vugt JM.
Performance of first-trimester combined test for Down syndrome in different maternal age groups: reason for adjustments in screening policy?.

Prenat Diagn 2011;
31 (13) 1241-1245 . Doi: 10.1002/pd.2873

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