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Traditional systematic reviews aim to summarise and draw conclusions based on the research related to a specific, narrowly defined research question. It will include previous original studies, both published and unpublished, based on pre-specified inclusion criteria. Importantly, the methods of the review are documented and reported
Integrative reviews (sometimes referred to as integrative syntheses) are reviews that attempt to integrate evidence from both quantitative and qualitative studies. The idea is that this provides a richer and more complete understanding of a complex phenomenon than either
Umbrella reviews are reviews of reviews. Most reviews attempt to synthesise original empirical studies. In contrast, umbrella reviews build on reviews and metaanalyses, thus representing a higher level of abstraction in an evidence hierarchy. As such, they are considered helpful, for instance
Rapid reviews are performed when evidence summaries are required quickly. They are typically modelled on the traditional systematic review, but the review process is somehow streamlined to save time. Such streamlining can involve, for instance, narrowing the scope, searching fewer databases, or extracting less data from each included study.