GRADE guidelines 4: rating the quality of evidence – study limitations (risk of bias) and publication bias

Guyatt GH, Oxman AD, Vist G, Kunz R, Brozek J, Alonso-Coello P, Montori V, Akl EA, Djulbegovic B, Falck-Ytter Y, Norris SL, Williams JW Jr, Atkins D, Meerpohl J, Schunemann H. GRADE guidelines 4: rating the quality of evidence – study limitations (risk of bias) and publication bias. Journal of Clinical Epidemiology 2011; 64: 407-15 . Vitenskapelig artikkel 2011.Journal of Clinical Epidemiology 2011; 64: 407-15