Reflections on Sigurd P. Ramfjord: his contributions to evidence-based periodontics.
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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