title: Comparing reliability between different ultrasound techniques.
authors.forename: W P
authors.initials: WP
authors.lastname: Martins
mesh_terms: D018568:Crown-Rump Length; D004622:Embryo, Mammalian / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D021621:Imaging, Three-Dimensional; D011247:Pregnancy; D016216:Ultrasonography, Prenatal