Barratt, A., Wyer, P. C., Hatala, R., McGinn, T., Dans, A. L., Keitz, S., . . . Guyatt, G. (2004). Tips for learners of evidence-based medicine: 1. Relative risk reduction, absolute risk reduction and number needed to treat. Canadian Medical Association.

Barratt, Alexandra, Peter C. Wyer, Rose Hatala, Thomas McGinn, Antonio L. Dans, Sheri Keitz, Virginia Moyer, i Gordon Guyatt. Tips for Learners of Evidence-based Medicine: 1. Relative Risk Reduction, Absolute Risk Reduction and Number Needed to Treat. Canadian Medical Association, 2004.

Barratt, Alexandra, et al. Tips for Learners of Evidence-based Medicine: 1. Relative Risk Reduction, Absolute Risk Reduction and Number Needed to Treat. Canadian Medical Association, 2004.