Abstract
The original Levels of Evidence, last updated in March 2009.
Cite
CITATION STYLE
APA
Phillips B, Ball C, Sackett D, Badenoch D, Straus S, Haynes B, D. M. (2001). Oxford Centre for Evidence-Based Medicine Levels of Evidence, (March 2009), 2001. Retrieved from Available at URL: http://www.cebm.net/index.aspx?o=1025;
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