Figure 1
The annual number of meta-analyses registered by PubMed. An overview of studies of the publication type "meta-analysis" from 1990 to 2005 in PubMed.
Figure 1 | BMC Medical Research Methodology
The annual number of meta-analyses registered by PubMed. An overview of studies of the publication type "meta-analysis" from 1990 to 2005 in PubMed.