Echt DS, Liebson PR, Mitchell LB, et al. Mortality and morbidity in patients receiving encainide, flecainide, or placebo. The Cardiac Arrhythmia Suppression Trial. N Engl J Med 1991; 324: 781-8.
Lu-Yao GL, McLerran D, Wasson J, Wennberg JE for the Prostate Patient Ourcomes Research Team. An assessment of radical prostatectomy: time trends, geographic variation, and outcomes. JAMA 1993; 269: 2633-6.
Sackett, Richardson, Rosenberg, and Haynes, Ed. "Evidence-Based Medicine: How to Practice and Teach EBM." 1st edition, Churchill-Livingstone, New York, 1997. page 2.
Smith R. What clinical information do doctors need? Br Med J 1996; 313: 1062-8.
Sox HC, Blatt MA, Higgins MC, Marton KI. "Medical Decision Making", 2nd ed. Butterworths, New York, 1988.
Wennberg J. Unwanted variations in the rules of practice. JAMA 1991; 265: 1306-7.