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Unmeasured variables or confounding factors may have influenced the observed relationship

When specifically examining the risk for lung cancer, the researchers found that the hazard ratios compared with never smokers were 5.64 (95% CI, 3.89-8.18) in lifelong nondaily smokers, 10.22 (95% CI, 8.29-12.60) in nondaily smokers who had previously been daily smokers and 13.96 (95% CI, 12.50-15.59) in daily smokers

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Peter, Paul and Mary was deeply committed to the Civil Rights Movement, and they performed at the historic 1963 March on Washington led by Dr

Getting your teeth regularly cleaned can also help to keep your mouth smelling better