The principle of this study is that, starting from the selection of cases (with the disease, etc.) and controls (no disease, etc.) and then, a number of cases and controls were compared in terms of factors like education, as substances or bacteria that cause. disease, serum markers, tissue markers, etc. For example, 100 lung cancer patients who never smoked -------------------------------. included 95 people, never smoked 5 people who normally do not have lung cancer never smoked --------------------- 100 people 10 people, 90 had never smoked. people
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