**2.7 Eligibility**

The entire article was accessed in the eligibility stage, which was the third step. The third step, eligibility, involves the writers manually checking the returned articles to make sure all the ones still there (after the screening procedure) meet the requirements. Reading the articles' titles and abstracts served as the first step in this approach we excluded 733 studies and included only 104 studies. There were just 80 items that were chosen overall that study fully utilized for further analysis (see **Figure 1**).
