We break exact linear dependency between the three explanatory variables (i.e., cohort = period age) and deal with under-identification by grouping birth cohorts into frequently used 5-year intervals, and, after confirmation of a curvilinear relationship, treat smoking as a quadratic function of age 30
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Smoking reduction, smoking cessation, and incidence of fatal and non-fatal myocardial infarction in Denmark 19761998: a pooled cohort study
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