title: The importance of assessing confounding and effect modification in research involving periodontal disease and systemic diseases.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Hyman
mesh_terms: D015986:Confounding Factors, Epidemiologic; D004194:Disease; D015987:Effect Modifier, Epidemiologic; D015340:Epidemiologic Research Design; D006801:Humans; D010510:Periodontal Diseases / Q000453:epidemiology*; D012307:Risk Factors; D012907:Smoking / Q000453:epidemiology