Agency for Healthcare Research and Quality - Systematic Review Data Repository (SRDR)
http://srdr.ahrq.gov
Campbell Collaboration
http://www.campbellcollaboration.org
Center for Reviews and Dissemination
http://www.york.ac.uk/inst/crd/index_guidance.htm
Cochrane Collaboration
http://www.cochrane.org
Joanna Briggs Institute
http://joannabriggs.org