title: 1991 JCO orthodontic practice study. 3. Practice growth.
authors.forename: E L
authors.initials: EL
authors.lastname: Gottlieb
authors.forename: A H
authors.initials: AH
authors.lastname: Nelson
authors.forename: D S
authors.initials: DS
authors.lastname: Vogels
mesh_terms: D006801:Humans; D007182:Income; D009970:Orthodontics / Q000706:statistics & numerical data*; D011215:Practice Management, Dental / Q000706:statistics & numerical data*; D014481:United States