title: Comment on "Nasal bone length: prenasal thickness ratio: a strong 2D ultrasound marker for Down syndrome".
authors.affiliation: Statistics and Actuarial Science, Simon Fraser University, Burnaby, Canada.
authors.forename: Rachel MacKay
authors.initials: RM
authors.lastname: Altman
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D009295:Nasal Bone / Q000000981:diagnostic imaging*; D011247:Pregnancy; D014463:Ultrasonography