Nivel de evidencia para los estudios clínicos

Bibliografía

1. Sackett D, Straus Sh E, Richardson W S, Rosenberg W, Haynes R B: Evidence- Based Medicine. How to Practice and Teach EBM. New York, Churchill Livinstone, 2000.
2. Wright JG, Swiontkowski M F, Heckman J D. Introducing levels of evidence to the journal. J Bone Joint Surg. 85A (1): 1-3. 2003.