First-trimester transvaginal ultrasonographic screening: incidence of structural anomalies.
Rottem
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D000013:Congenital Abnormalities / Q000000981:diagnostic imaging*; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal