title: How many years must a profession exist...?
authors.forename: William M
authors.initials: WM
authors.lastname: Hang
mesh_terms: D005145:Face / Q000033:anatomy & histology; D006801:Humans; D008310:Malocclusion / Q000150:complications / Q000628:therapy; D009970:Orthodontics / Q000639:trends*; D013705:Temporomandibular Joint Disorders / Q000209:etiology