title: How accurate is a second-trimester prenatal ultrasound in the diagnosis of Down syndrome?
authors.affiliation: University of Virginia Family Medicine, Charlottesville, USA. cms2a@virginia.edu
authors.forename: C
authors.initials: C
authors.lastname: Smalley
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging*; D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D015201:Meta-Analysis as Topic; D017410:Practice Guidelines as Topic; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D015203:Reproducibility of Results; D012107:Research Design; D016216:Ultrasonography, Prenatal / Q000592:standards*