title: [Single or double?].
authors.forename: H P
authors.initials: HP
authors.lastname: Freihofer
mesh_terms: D003813:Dentistry / Q000639:trends; D004497:Education, Dental; D005544:Forecasting; D006801:Humans; D009426:Netherlands; D012953:Societies, Dental; D013039:Specialties, Dental / Q000639:trends
vernacular_title: Enkel of dubbel?