Epidemiological studies that try to determine the relationship between an exposure and a disease are immune to the disturbing influences of extraneous factors known as confounders.
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Q5: Because cases serve as their own controls,
Q6: The high degree of validity in which
Q7: Which type of studies typically take a
Q8: Because observational studies are often infeasible because
Q9: Both the cross-sectional and ecological designs have
Q11: Which term includes both surveillance, whose purpose
Q12: The use of placebos permits which of
Q13: The process of gaining the agreement of
Q14: The failure to observe the requirements of
Q15: Which of the following is an increasingly
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