Figure 2. Quality assessment of cohort and cross-sectional selected studies.

Five cohort and one cross-sectional studies were included in this systematic review. Studies received up to one point for meeting the criteria within each of the 14 questions established by the National Institutes of Health (NIH) Study Quality Assessment Tools [19], with a maximum score of 14. Studies were given quality scores of good (11-14), fair (7-10), or poor (0-6).

Citations: Clarke et al. [20], Hossain et al. [21], Pattinson et al. [22]. Posti et al. [23], Shahim et al. (2017) [24], and Shahim et al. (2018) [25].