Cumulative meta-analysis to evaluate small-study effect. Studies are ordered according to descending variance on odds ratios. The vertical line indicates the no-association line (OR 1.0). Each study is represented by a horizontal line, corresponding to the OR (or estimates ES) and symmetric 95% CI.
Gillet et al. BMC Infectious Diseases 2011 11:10 doi:10.1186/1471-2334-11-10