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2. Kleinbaum, D. G., Kupper, L. L., and Morgenstern, H.,Epidemiologic Research: Principles and Quantitative Methods Lifetime Learning Publications, Belmont California, 1982.
3. Beebe, G. W., and deBakey, M. E.,Battle Casualties: Incidence, Mortality, and Logistic Considerations Charles C Thomas, Springfield, Illinois, 1952.