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Mortality of Smokers and Nonsmokers
two variables does not necessarily prove that a direct causal relationship exists between them. This ... been persuaded to smoke ciga- rettes, there is no direct evidence of the effects which cigarette smoking ...- Authors: William J November, E Cuyler Hammond, Robert C Hockett, W Harding Le Riche
- Date: Jan 1964
- Competency: External Forces & Industry Knowledge
- Publication Name: Transactions of the SOA
- Topics: Experience Studies & Data>Mortality