Table 3. Risk of bias of included studies (Yes, Low risk of bias; No, High risk of bias).
| Citations | Adequate sequence generation? | Allocation concealment? | Blinding? | Incomplete outcome data addressed? | Free of selective reporting? | Conclusions |
|---|---|---|---|---|---|---|
| Muretzani et al. (2015)32) | Yes | Yes | No | Unclear | Unclear | High risk of bias |
| Garcia et al. (2013)31) | Yes | Yes | No | Yes | Unclear | High risk of bias |
| Franca et al. (2012)27) | No | No | No | Yes | Unclear | High risk of bias |
| Paatelma et al. (2008)30) | Yes | No | No | Yes | Unclear | High risk of bias |
| Koumantakis et al. (2005)35) | Yes | Yes | No | Yes | Unclear | High risk of bias |
| Peterson et al. (2002)29) | Yes | Yes | Yes | Yes | Unclear | Low risk of bias |
| Moon et al. (2013)36) | No | No | No | Yes | Unclear | High risk of bias |
| Kuppusamy et al. (2013)3) | Yes | No | No | Yes | Unclear | High risk of bias |
| Hosseinifar et al. (2013)34) | No | No | No | Yes | Unclear | High risk of bias |
| Miller et al. (2005)33) | No | No | No | Yes | Unclear | High risk of bias |