Results from quality assessments
The quality details of bias assessment are presented in Table 2, and the Cochrane Collaboration tool was applied for evaluating the risk of bias 32. Briefly, participant’s random allocation was mentioned in all included trials. However, eight trials described the method of random sequence generation15-17,21-24,26. Five trials reported allocation concealment15,17,22,25,37. Most studies represented low risk of bias based on selective reporting; nevertheless, 5 studies had high risk of bias17,18,23,24,35. All studies had a low risk of bias for incomplete outcome data. Five studies had a low risk of bias for blinding of participants and personnel15,18,21,22,25and six studies had high risk of bias regarding blinding outcome assessors15,16,22,26,37,39. All of studies had low or unclear risk of bias regarding other potential threats to validity.