Systems for grading the quality of evidence and the strength of recommendations II: Pilot study of a new system by Oxman Andrew D, Phillips Bob, O'Connell Dianne, Mason James, Magrini Nicola, Liberati Alessandro, Jaeschke Roman, Hill Suzanne, Harbour Robin T, Guyatt Gordon H, Flottorp Signe, Eccles Martin, Briss Peter A, Atkins David, Schünemann Holger, Edejer Tessa, Vist Gunn E, Williams John W

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