The catmap.cumulative conducts cumulative meta-analyses
and creates plots of Odds Ratios (OR) and Confidence Intervals (CI)
using a fixed-effects or random-effects model. Note that studies
should be listed in chronological order in the input file! This
function does not re-order studies by publication year! Also
note that random-effects estimates are not defined for a single
(i.e., the first) study.