Cochrane Stroke Group: twenty years of evidence-based stroke medicine.

The Cochrane Stroke Group was one of the first specialist review groups set up within The Cochrane Collaboration and has been in existence for 20 years. Its key outputs include a number of high profile reviews in the area of the management of stroke, which have become one of the most important sources of information for clinical practice guidelines. The work of the group is only possible through a collaborative network of staff, editors, and authors.