A recent study found that screening for disease. X led to increase survival in the study. Those who were screened were generally younger, healthier, and more aware of their health than those who are not screened. This makes it hard to evaluate whether the improvement and survivorship was due to the screening program or due to the characteristics of those who were screened. What is the name of the issue when evaluating the effect of the screening program?
[Answered]: A recent study found that screening for disease
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