Fig. 2

Quality assessments results for qualitative and quantitative studies according to the Standard Quality Assessment Criteria [19]. The qualitative studies could reach a maximum score of 40 points (2 reviewers × 10 items × 2 points), the quantitative studies of 44 points (2 reviewers × 14 items × 2 points – (2 reviewers × 3 items × 2 points)). The results are presented as a percentage of the maximum scores