Question 1: 150 words
Describe the common characteristics and design of a case-control study. Discuss the three important features when it comes to selecting cases and controls and identify a situation when one of these might be violated. Discuss the limitations of using questionnaires for determining exposure status and provide examples of alternative strategies for collecting this information in a case-control study.
Question 2: 150 words
Discuss the strengths and weaknesses of cross-sectional studies and examples of how they can be "descriptive" or "analytic" study designs. Discuss an example of a disease where survival could influence the association between a possible exposure and the disease when
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