title: Reflections on Sigurd P. Ramfjord: his contributions to evidence-based periodontics.
authors.forename: M M
authors.initials: MM
authors.lastname: Ash
mesh_terms: D019317:Evidence-Based Medicine / Q000266:history*; D049673:History, 20th Century; D008824:Michigan; D009664:Norway; D010512:Periodontal Index; D010517:Periodontics / Q000266:history*; D014481:United States; D014495:Universities / Q000266:history