*3.6. Quality Assessment*

On the Jadad Scale, the average quality of the analyzed studies was 3.75 (Figure 2). Its reporting quality varied from 2 (in four studies), 3 (in two studies), 4 (in nine studies), and 5 (in five studies), with none of them having an inappropriate reporting quality (lower than 1). At last, four of the studies reviewed received support from different manufacturers, indicating the possibility of a sponsorship bias [26,31,36,40].

**Figure 2.** Risk of bias summary using the Jadad Scale for each included study.
