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Which of the stock markets listed below is the smallest, as judged by trading volume?
Randomized Clinical Trial
A scientific study in which participants are randomly assigned to one of the treatment or control groups to assess the efficacy of a medical intervention.
Before-after Study
A study design in which the same group of subjects is measured before and after a specific intervention or event, to assess its effects.
Case-control Study
A type of observational study where two groups are compared: those with the disease or outcome of interest (cases) and those without the disease (controls), to identify factors that may contribute to the disease's presence.
Case-series
A descriptive study type that tracks subjects with a known exposure or treatments to document outcomes.
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