GRADE guidelines: 4. Rating the quality of evidence—study limitations (risk of bias)
Guyatt, Gordon H ; Oxman, Andrew D ; Vist, Gunn ; Kunz, Regina ; Brozek, Jan ; Alonso-Coello, Pablo ; Montori, Victor ; Akl, Elie A ; Djulbegovic, Ben ; Falck-Ytter, Yngve ; Norris, Susan L ; Williams, John W ; Atkins, David ; Meerpohl, Joerg ; Schünemann, Holger J
Journal of clinical epidemiology, 2011-04, Vol.64 (4), p.407-415 [Periódico revisado por pares]New York, NY: Elsevier Inc
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