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Systems for grading the quality of evidence and the strength of recommendations I: Critical appraisal of existing approaches The GRADE Working Group

David Atkins, Martin Eccles, Signe Flottorp, Gordon H Guyatt, David Henry, Suzanne Hill, Alessandro Liberati, Dianne O'Connell, Andrew D Oxman, Bob Phillips, Holger Schünemann, Tessa TT Edejer, Gunn E Vist*, John W Williams and The GRADE Working Group

BMC Health Services Research 2004, 4:38 doi:10.1186/1472-6963-4-38

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