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Review Question - QID 212707

Observational Studies Cohort Study Compares groups with and without an exposure to assess associations with subsequent disease QID: 212707 (M1.OMB.19.1)
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QID 212707 (Type "212707" in App Search)
A researcher wants to study how smoking electronic cigarettes affects the risk of developing lung cancer. She decides to perform a cohort study and consults a medical statistician in order to discuss how the study should be designed. After looking at the data she has available, she concludes that she will perform a retrospective study on existing patients within her database. She then discusses how to set up the experimental and control groups for comparison in her study. Which of the following would be the most appropriate set of experimental and control groups for her cohort study, respectively?
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