title: Case-control studies: Part 1.
authors.affiliation: Bern, Switzerland, and Corfu, Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Pandis
mesh_terms: D015982:Bias; D016022:Case-Control Studies; D015986:Confounding Factors, Epidemiologic; D018865:Dental Research / Q000706:statistics & numerical data; D006801:Humans; D012307:Risk Factors