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18. The following question is based on the information given below. Comparison of mortality rates due to cancer of the uterus in users and non-users of supplemental estrogen revealed: ,Mortality rates per 100,000, Age, 45-54 55-70,Users of estrogen 3.0 17.0,Non-users of estrogen 1.0 6.0,, Case-control studies are among the best observational designs to study diseases of: ,A)high prevalence.,B)high validity.,C)low case fatality.,D)low prevalence.,

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