At the beginning of the review process, you will conduct a thorough search to ensure you are not replicating an existing review. During this stage, you will also:
Chapter 1 of the Cochrane Handbook for Systematic Reviews of Interventions provides detailed guidance for beginning a review.
Before starting work on a systematic review, check to see that a systematic review does not already exist or is currently under way.
Existing systematic reviews may also provide a starting point for selecting a review topic and for reviewing protocols.
The average time to complete a systematic review is 18 months. Below is suggested timeline from Cochrane:
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