title: [Ultrasonography early in the pregnancy].
authors.forename: K A
authors.initials: KA
authors.lastname: Salvesen
authors.forename: H G
authors.initials: HG
authors.lastname: Blaas
authors.forename: S H
authors.initials: SH
authors.lastname: Eik-Nes
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal