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1 Trend analysis of grading systems for level of evidence and strength of recommendation
Kyung Hwa Seo, Sun Hee Lee, Ein Soon Shin, Sun Mi Lim, Ji Eun Jang, Yu Min Jung, Yoon Hyung Park
J Korean Med Assoc.2011;54(7):758-768.   Published online 2011 July 13     DOI: http://dx.doi.org/10.5124/jkma.2011.54.7.758
      

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