1. Patients at the center: in our practice, and in our use of language;Guyatt;ACP J Club.,2004
2. Improving the quality of reports of meta-analyses of randomised controlled trials: the QUOROM statement;Moher;Lancet.,1999
3. Wells GA,Shea B,O'Connell D, et al. The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomized studies in meta-analysis. Ottawa Health Research Institute, University of Ottawa, Ontario, Canada. http://www.ohri.ca/programs/clinical_epidemiology/oxford.htm. Accessed: March 21, 2006.
4. Meta-analysis in clinical trials;DerSimonian;Control Clin Trials.,1986
5. What to add to nothing? Use and avoidance of continuity corrections in meta-analysis of sparse data;Michael;Stat Med.,2004