Figure 2.
Figure depicting the number of included studies in the soping review according to the correspondent author's continent (33.3% in the Americas, 33.3% in Asia, 25% in Europe and 8.3% in Oceania). And the number of publication per decade( 2 studies in the 1990s, 2 studies in the 2000s, 12 studies in the 2010s, and 8 studies in the 2020s).

Distribution of included studies (n = 24) according to corresponding author’s continent (A) and decade of publication (B).

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