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John Snow, considered one of the fathers of modern epidemiology studied the outbreak of cholera in London in the mid-nineteenth century. What type of epidemiology

John Snow, considered one of the fathers of modern epidemiology studied the outbreak of cholera in London in the mid-nineteenth century. What type of epidemiology study was he conducting? a. Case series study. b. Cross-sectional study. c. Cohort study. d. Case-control study

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