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2. Public Law 111-5. The American Recovery and Reinvestment Act. 2009.
3. Federal Coordinating Council for Comparative Effectiveness Research: Report to the President and the Congress,2009
4. Comparative effectiveness research: a report from the Institute of Medicine;Sox;Ann Intern Med,2009
5. Oxford Centre for Evidence-based Medicine Levels of Evidence (March 2009). Centre for Evidence Based Medicine. 2009.