Hello!
Here is what appears to be a useful website http://www.cochrane.org
Here is their discription of what it contains, does. It is based in UK.
Cochrane Reviews are published in The Cochrane Library – an online collection of databases that brings together in one place rigorous and up-to-date research on the effectiveness of healthcare treatments and interventions, as well as methodology and diagnostic tests.
There are over 4,000 Cochrane Reviews currently available in The Cochrane Library. As many as 2,000 protocols for Cochrane Reviews are also available, providing an explicit description of the research methods and objectives for Cochrane Reviews in progress.
Enjoy,
Lars