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However, there might be residual confounding due to variables other than those included in the analysis, such as a difference in physical activity between smokers and non-smokers, and the observed relationship between tobacco smoking and impaired systolic function should not be interpreted as direct causality

Progress in Rubber, Plastics and Recycling Technology 36 (1), 317 (2020)

The pathogenesis of atherosclerosisAn update

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In the early versions a gear system was used to turn a fire steel to produce sparks and ignite the fuse