title: Superimposed tracings show questionable results.
authors.forename: Helmer E
authors.initials: HE
authors.lastname: Pearson
mesh_terms: D000328:Adult; D002508:Cephalometry / Q000379:methods*; D005260:Female; D006801:Humans; D008311:Malocclusion, Angle Class I / Q000000981:diagnostic imaging*; D011859:Radiography; D013382:Subtraction Technique