*3.1. Study Selection*

Figure 1 details a flowchart of the study selection. All of the electronic search strategies resulted in 387 potential manuscripts. A total of 378 studies were excluded because they did not meet the inclusion criteria. Additionally, a manual search was carried out to analyze the references cited in nine of the articles that were included in this work. Finally, nine more articles were incorporated from the manual search. At the end, a total of eighteen studies were analyzed.

**Figure 1.** Flowchart.
