This Cochrane Group is no longer active
Due to changes in NIHR funding in evidence synthesis, this Cochrane Group is no longer active. We are so grateful for the work of our contributors.
If you would like to get involved with Cochrane, please visit our Join Cochrane pages.
To learn more about Cochrane, visit our homepage.
If you would like to propose a topic for a Cochrane Review, please see our instructions for authors.
If you have any queries, please contact Cochrane Support.