Source: Sackett, D.L. et al. (1996) Evidence based medicine: what it is and what it isn't. BMJ 312 (7023), 13 January, 71-72).
• For more reading on Evidence Based Healthcare and useful references, see BMJ 1996;312:71-72 (13 January) Evidence based medicine: what it is and what it isn't
• Definitions of evidence-based practice - from Sheffield University's Netting the Evidence.