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MAPLE study cohorts. The five cohorts included CanCHEC 1991, CanCHEC 1996, CanCHEC 2001, Stacked CanCHEC, and CCHS. The Stacked CanCHEC and CCHS cohorts included groups of respondents that entered the study in different census or survey years (dashed lines). Participants were followed until death or the end of the study.
