Risk of bias
Considering the Cochrane tool for risk of bias, the overall evaluation
resulted in 4 studies with a high risk of bias and 2 studies with
uncertain risk. Five studies had a limited number of participants. Also,
the absence of the source of financing in 1 studies. Further, 2 studies
did not disclose the information on the conflict of interest statement.
Figure 1. Flow Chart of the article selection process.