Periodontal disease: Part I--Biological mechanisms and risk factors.
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D006801:Humans; D010510:Periodontal Diseases / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology*; D010518:Periodontitis / Q000209:etiology / Q000473:pathology; D012307:Risk Factors; D014481:United States / Q000453:epidemiology