1 Sackett DL Strauss SE Richardson WS Rosenberg W Haynes RB . Evidence-based medicine: how to practice and teach EBM.London: Churchill Livingston; 2000.
2.
2 GH Guyatt D Rennie , (eds). Users' guides to the medical literature: a manual for evidence-based clinical practice.Chicago: American Medical Association; 2002.
3.
3 Guyatt GH Haynes RB Jaeschke RZ Cook DJ Green L Naylor CD , for the Evidence-Based Medicine Working Group, et al.Users' guides to the medical literature: XXV. Evidence-based medicine: principles for applying the users' guides to patient care. JAMA2000; 284: 1290–1296.