Atkins D, Eccles M, Flottorp S, Guyatt GH, Henry D, Hill S, Liberati A, O’Connell D, Oxman AD, Phillips B, Schünemann H, Edejer TT, Vist GE, Williams JW and The GRADE Working Group (2004)

Systems for grading the quality of evidence and the strength of recommendations I: Critical appraisal of existing approaches The GRADE Working Group. BMC Health Services Research 2004 4:38 doi.org/10.1186/1472-6963-4-38.

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