Grading quality of evidence and strength of recommendations for diagnostic tests and strategies. - Schünemann, H; Schünemann, A; Oxman, A; Brozek, J; Glasziou, P; Jaeschke, R; Vist, G; Williams, J; Kunz, R; Craig, J; Montori, V; Bossuyt, P; et al. (BMJ (Clinical research ed.), 2008)