title: The examination of the embryo and early fetus: how and by whom?
authors.forename: H G
authors.initials: HG
authors.lastname: Blaas
mesh_terms: D004622:Embryo, Mammalian / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal