1. Systematic reviews in health care: meta-analysis in context,2001
2. Quality of Cochrane reviews: assessment of sample from 1998;Olsen;BMJ,2001
3. The Cochrane Library, Issue 4, 2003,2003
4. Alderson P, Green S, Higgins JPT, editors. Cochrane Reviewers' Handbook 4.2.2 [updated March 2004]. In: The Cochrane Library, Issue 1, 2004. Chichester, UK: John Wiley & Sons.
5. Review Manager (RevMan) [Computer program; CD-ROM and Internet]. Version 4.2 for Windows. Oxford: The Cochrane Collaboration; 2002. Available at: http://www.cc-ims.net/RevMan/.