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Agency for Healthcare Research and Quality - http://www.ahrq.gov/
British Medical Journal - http://bmj.bmjjournals.com/
National Guideline Clearinghouse - http://guideline.gov
Oxford Center for Evidence-Based Medicine - http://www.cebm.net
The Centre for Evidence-Based Medicine at the University of Toronto Health Network - http://www.cebm.utoronto.ca/
The Cochrane Collaboration - http://www.cochrane.org/
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