Cochrane Database of Systematic Reviews (COCH) is part of Wiley's Evidence Based Medicine Reviews collection. It contains two types of reviews: “Protocols” and “Cochrane Methodology Reviews”. Cochrane Methodology Reviews are full-text reports that are both highly structured and systematic. Evidence from methodological research is included or excluded on the basis of explicit quality criteria, thus minimizing bias. Data from studies are often combined statistically to increase the power of the findings of numerous studies, which on their own may be too small to produce reliable results. In such cases, the review may also include graphs presenting the data from each individual study. Protocols have no full-text. They are place-holders for reviews, which are still being written. They summarize the background and the rationale of the review.
Cochrane Database of Systematic Reviews - COCH