title: Periodontology in the past 20 years.
authors.forename: H
authors.initials: H
authors.lastname: Löe
mesh_terms: D010520:Aggressive Periodontitis; D006801:Humans; D010510:Periodontal Diseases / Q000209:etiology / Q000517:prevention & control; D010517:Periodontics / Q000639:trends*