GRADE : what is quality of evidence and why is it important to clinicians?
GUYATT, Gordon H ; OXMAN, Andrew D ; VIST, Gunn E ; KUNZ, Regina ; FALCK-YTTER, Yngve ; SCHÜNEMANN, Holger J
BMJ. British medical journal (International ed.), 2008-05, Vol.336 (7651), p.995-998 [Periódico revisado por pares]London: British Medical Association
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