Figure 3: Distribution of papers based on publication date
Source : authors
Figure 4 shows the geographical distribution of the articles identified
after the exclusion of the duplicates, while Figure 5 shows the
geographical distribution of the included papers. In the case of the
identified papers (Figure 4), the highest frequency of publications
comes from the United States and England. However, after the conclusion
of Stage 2.1 (identifying, selecting and the inclusion of papers), the
geographic dispersion of the publications has changed. The concentration
of papers originating from Europe increased (20), followed by Asia (4).
South America and Oceania have one paper each.