*2.3. Methodology of Calculations*

When working with two databases (WoS and Scopus), it is essential to determine the overlap level between both databases in relation to the identified articles and their degree of coverage. For this purpose, Meyer's index, traditional overlapping (TO), and relative overlapping (RO), which are the appropriate tools to identify the overlap level of indexed articles [30,31], were applied (Table 2). Although the overlap phenomenon has been known for more than 50 years, it is only in the last decade that there has been a greater interest in its study and application [30].


**Table 2.** Formulas to determine the level of overlap and degree of coverage between databases.

Note: calculations complementary to Meyer´s index. The creation algorithms used allow us to consider all the possible existing unions between the databases selected for the analysis [35], covering with them all the necessary edges to determine the overlapping of current information. Source: own elaboration.

## *2.4. Systematization of Information*

To finish the construction of the study matrix (final ad hoc database) through the review of the identified bibliographic sources, the data collected was refined and normalized. This process led to the elimination of duplicate documents or those lacking any relationship with the subject of study, the latter situation generated by an inappropriate use of keywords by the authors during their indexation. As a result, the joint study matrix built in Microsoft Office Excel software was made up of 103 articles, and for the individual analysis of each of the databases, the original matrices constituted by 84 articles published in Scopus and 51 in WoS were maintained. The bibliographic references were managed with EndNote.

The methodological process of the study is shown in Figure 1.

**Figure 1.** Bibliometric methodological procedure. Source: own elaboration.

### **3. Results**
