TABLE 2.
Risk of bias assessment according to the Cochrane Collaboration's Risk of Bias assessment tool
| Study, year (reference) | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Overall assessment of risk of bias |
|---|---|---|---|---|---|---|---|
| Uribarri et al., 2011 (25) | Unclear | Unclear | Unclear | Unclear | Low | Low | Unclear |
| Vlassara et al., 2016 (35) | Low | Unclear | Unclear | Low | Low | Low | Unclear |
| Uribarri et al., 2014 (28) | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear |
| Di Pino et al., 2016 (36) | Low | Unclear | Unclear | Unclear | Low | Low | Unclear |
| Baye et al., 2017 (34) | Low | Unclear | Low | Low | Low | Unclear | Unclear |
| Semba et al., 2014 (32) | Low | Low | Unclear | Low | Low | Low | Unclear |
| Mark et al., 2014 (26) | Unclear | Unclear | Unclear | Unclear | Low | Low | Unclear |
| Harcourt et al., 2011 (27) | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear |
| Macías-Cervantes et al., 2015 (33) | Low | Low | Unclear | Low | Unclear | Low | Unclear |
| Luévano-Contreras et al., 2012 (37) | Low | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear |
| Cai et al., 2004 (29) | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear |
| Vlassara et al., 2002 (30) | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear |
| Tantalaki et al., 2014 (31) | High | High | Unclear | Unclear | Unclear | Low | High |