2.4. | Quality assessment of studies
The risk of bias for RCTs in the included studies was performed using
the Cochrane criteria [38]. The objects applied for the evaluation
of any study were as follows: adequacy of sequence generation,
allocation concealment, blinding addressing of dropouts (incomplete
outcome data), selective outcome reporting, and other expected sources
of bias. According to the Cochrane Handbook recommendation, studies were
determining to low risk of bias, high risk of bias or unclear regarding
any parameters (Table 1).