title: [The fetal nasal bone in the first trimester -- precise assessment using 3D sonography].
authors.forename: E
authors.initials: E
authors.lastname: Merz
mesh_terms: D005260:Female; D007839:Functional Laterality; D006801:Humans; D009295:Nasal Bone / Q000000981:diagnostic imaging* / Q000196:embryology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D015203:Reproducibility of Results; D016216:Ultrasonography, Prenatal / Q000379:methods*