Table 4. Risk of bias summary.

Study	Selection bias	Performance bias	Detection bias	Reporting bias
Berry et al.20	High	High	High	Low
Lau et al.4	High	High	High	High
Kachare et al.16	High	High	High	High
Garzon et al.3	High	High	High	High
Paul et al.26	High	High	High	High
Wang et al.22	High	High	High	High