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160. In clinical trials, what epidemiological principle aims to ensure that the patient groups receiving different treatments are similar in all aspects except for the treatment itself?
Blinding.
Matching.
Randomization.
Stratification.
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159. A study attempts to estimate the prevalence of diabetes by administering a questionnaire that asks about self-reported diagnosis. What critical type of bias might this introduce?
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161. A cluster of severe birth defects is reported in a community. What is the urgent epidemiological action?
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