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Hazard ratios (which are equivalent to, and described here as relative risks [RRs]) for mortality in men and women were estimated separately for men and women and according to birth cohorts with sufficient amounts of data, using Cox regression modelling, in which the underlying time variable was age

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The English and Dutch had contact with the pipe-smoking natives of North America, and adopted the habit

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Bai FL, Yamano M, Shiotani Y, Emson PC, Smith AD, Powell JF et al (1985)