1. Evidence based medicine: what it is and what it isn't. 1996;Sackett DL;Clin Orthop Relat Res.,2007
2. Introducing levels of evidence to the journal;Wright JG;J Bone Joint Surg Am.,2003
3. Level of evidence in orthopaedic journals;Obremskey WT;J Bone Joint Surg Am.,2005
4. The journal club. Teaching critical evaluation of clinical literature in an evidence-based environment;Letterie GS;J Reprod Med.,2000
5. and evaluating journal clubs in orthopaedic surgery;Dirschl DR;Clin Orthop Relat Res.,2003