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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 Tan-Torres Edejer , Gunn E Vist , John W Williams Jr and The GRADE Working Group

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

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