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

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

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