Critically appraise one of the following papers and assess the extent to which there is a causal association between the main study factor(s) and the outcome.

Heeringa J, van der Kuip DAM, Hofman A, Kors JA, van Herpen G, Stricker BHC, et al. Prevalence, incidence and lifetime risk of atrial fibrillation: the Rotterdam study. European Heart Journal 2006;27(8):949-53.

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