title: A statistical artifact.
authors.forename: C M
authors.initials: CM
authors.lastname: Russell
authors.forename: W O
authors.initials: WO
authors.lastname: Thompson
mesh_terms: D016477:Artifacts; D003724:Dental Arch / Q000033:anatomy & histology; D006801:Humans; D009971:Orthodontics, Corrective / Q000706:statistics & numerical data*; D011897:Random Allocation