Sounds like a systematic review... good if there was more on measures of effects i.e. effects sizes, fixed vs random vs mixed fx models. Also why meta-analysis works well with RCTs as opposed to other designs like case-control studies, cohort studies etc. selection and measurement errors etc. FYInterest: http://www.meta-analysis.com/downloads/Meta%20Analysis%20Fixed%20vs%20Random%20effects.pdf
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