A researcher is trying to determine whether or not psychotherapy for bulimia works. There are 5 previous studies that have looked at the effect of psychotherapy in bulimia. The researcher pools the data from all 5 of these trials to see how well psychotherapy works in bulimia. What type of study is this?

A. Case study

B. Case-control study

C. Cohort study

D. Meta-analysis

E. Clinical trial

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