title: Active and passive smoking: assessment issues in periodontal research.
authors: Clemens
authors: C
authors: Walter
authors: Elizabeth K
authors: EK
authors: Kaye
authors: Thomas
authors: T
authors: Dietrich
mesh_terms: D015415:Biomarkers / Q000032:analysis; D015986:Confounding Factors, Epidemiologic; D016021:Epidemiologic Studies; D006801:Humans; D007564:Japan / Q000453:epidemiology; D010510:Periodontal Diseases / Q000453:epidemiology*; D015995:Prevalence; D012307:Risk Factors; D012907:Smoking / Q000453:epidemiology*; D016540:Smoking Cessation / Q000706:statistics & numerical data; D014028:Tobacco Smoke Pollution / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology
chemical_list: D015415:Biomarkers; D014028:Tobacco Smoke Pollution