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In the final model, we included a spline on age, random slope on age by study and the bias covariate encoding exposure definition (that is, current, former and ever smokers), which was picked by the variable selection algorithm 28,29

Lung cancer incidence by smoking status in Korean men: 16 years of observations in the Seoul Male Cancer Cohort study

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Washington (DC): The International Bank for Reconstruction and Development / The World Bank

Experimenting with taking multiple nicotine lozenges or similar things could be harmful or fatal and anyone suspected of having somehow consumed a nicotine overdose needs very prompt medical attention

Legal action will be initiated against the company if it did not comply, he wrote in the letters, copies of which were reviewed by Reuters