title: Advancing further the sonographic estimation of Down syndrome risk--how early can we go?
authors.affiliation: Diagnostic Ultrasound Associates, 333 Longwood Avenue, Boston MA 02115, USA. bbsono@aol.com
authors.forename: B
authors.initials: B
authors.lastname: Benacerraf
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D018570:Risk Assessment; D016216:Ultrasonography, Prenatal