2.2.2.2 Policy on updating Cochrane Reviews and converting Protocols

It is Collaboration policy that Cochrane Reviews should either be updated within two years or should have a commentary added to explain why this is done less frequently. It is also Collaboration policy that Protocols that have not been converted into full Cochrane Reviews within two years should generally be withdrawn from the Cochrane Database of Systematic Reviews.

[Note: The two-year term should commence from the date of first publication.]