title: Study questioned.
authors.forename: T Alan
authors.initials: TA
authors.lastname: Peterson
mesh_terms: D006801:Humans; D009971:Orthodontics, Corrective; D010510:Periodontal Diseases / Q000145:classification*; D012107:Research Design / Q000592:standards / Q000706:statistics & numerical data; D012196:Review Literature as Topic