GRADE guidelines: 9. Rating up the quality of evidence

Guyatt GH, Oxman AD, Sultan S, Glasziou P, Akl EA, Alonso-Coello P, Atkins D, Kunz R, Brozek J, Montori V, Jaeschke R, Rind D, Dahm P, Meerpohl J, Vist G, Berliner E, Norris S, Falck-Ytter Y, Murad MH, Schünemann HJ; The GRADE Working Group. GRADE guidelines: 9. Rating up the quality of evidence. Journal of Clinical Epidemiology 2011; 64: 1311-6. . Vitenskapelig artikkel 2011.Journal of Clinical Epidemiology 2011; 64: 1311-6.