Table 2B: Quality assessment of included randomized controlled trials (Cochrane criteria)
| Study | Year | Random sequence generation (Selection bias) | Allocation concealment (Selection bias) | Blinding of participants and personnel (Performance bias) | Blinding of outcome assessment (Detection bias) | Incomplete outcome data (Attrition bias) | Selective reporting (Reporting bias) | Other bias | |||||||||
| Samuelson et al. | 2011 | Low | Unclear | High | Low | High | Low | Low | |||||||||
| Fea et al. | 2014 | Unclear | Unclear | High | High | Low | Low | Low | |||||||||
| Fea | 2010 | Low | Unclear | Low | Low | Low | Low | Low | |||||||||
| Fernandez-Barrientos et al. | 2010 | Low | Unclear | Unclear | Low | Low | Low | Low | |||||||||
| Katz et al. | 2015 | Unclear | Unclear | High | High | Low | Low | Low |