Table 1 Presentation of risk of bias evaluation for included studies according to the cochrane collaboration's tool
| Â | Random sequence generation | Allocation concealment | Blinding of participants | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|
Murbay et al. [18] | Unclear risk of bias | Unclear risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Dwisaptarini et al. [19] | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Pulijala et al. [20] | Low risk of bias | Unclear risk of bias | High risk of bias | Low risk of bias | High risk of bias | Low risk of bias | Low risk of bias |
Tubelo et al. [21] | Low risk of bias | Low risk of bias | High risk of bias | Low risk of bias | High risk of bias | Low risk of bias | Low risk of bias |
Samuel Koo et al. [22] | Low risk of bias | Low risk of bias | High risk of bias | Unclear risk of bias | Unclear risk of bias | Low risk of bias | Low risk of bias |
Hirono Kikuchi et al. [23] | Unclear risk of bias | Unclear risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Riki Gottlieb et al. [24] | Unclear risk of bias | Unclear risk of bias | Unclear risk of bias | High risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Nardy Casap et al. [25] | Low risk of bias | Unclear risk of bias | High risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Suebnukarn et al. [26] | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Buchanan et al. [27] | Unclear risk of bias | High risk of bias | Unclear risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Al-Saud et al. [28] | Low risk of bias | Unclear risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Liebermann et al. [14] | Low risk of bias | Unclear risk of bias | Unclear risk of bias | High risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
Zhang et al. [29] | Low risk of bias | Low risk of bias | Unclear risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |
SiahMansoory et al. [13] | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias | Low risk of bias |