Meta-Analysis, no matter how beautifully done, is practically as useless as any other evidence if it is not interpreted properly.
A comprehensive handbook can be found online here:
Cochrane Handbook
for Systematic Reviews of Interventions
Higgins JPT, Green S (editors). Cochrane Handbook for Systematic Reviews of Interventions Version 5.1.0 [updated March 2011]. The Cochrane Collaboration, 2011. Available from www.cochrane-handbook.org.
However, for a shorter more practical guide in understanding meta-analysis graphs click here
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