Guyatt, G. H., Oxman, A. D., Kunz, R., Vist, G. E., Falck-Ytter, Y., & Schünemann, H. J. (2008). What is “quality of evidence” and why is it important to clinicians? BMJ Publishing Group Ltd.

Guyatt, Gordon H., Andrew D. Oxman, Regina Kunz, Gunn E. Vist, Yngve Falck-Ytter, ja Holger J. Schünemann. What Is “quality of Evidence” and Why Is It Important to Clinicians? BMJ Publishing Group Ltd, 2008.

Guyatt, Gordon H., et al. What Is “quality of Evidence” and Why Is It Important to Clinicians? BMJ Publishing Group Ltd, 2008.