title: Cephalometric reference planes--sella nasion vs Frankfort horizontal.
authors.forename: E
authors.initials: E
authors.lastname: Ellis
authors.forename: J
authors.initials: J
authors.lastname: McNamara
mesh_terms: D000328:Adult; D002508:Cephalometry / Q000379:methods*; D005260:Female; D006801:Humans; D008311:Malocclusion, Angle Class I; D012015:Reference Standards