Table 4.
Risk of bias of clinical trials.
| Study ID | Adequate sequence generation | Allocation concealment | Blinding of participant & personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other sources of bias |
|---|---|---|---|---|---|---|---|
| Glenn 2015 | Unclear | Unclear | Low | Low | Low | Unclear | Unclear |
| Heldens 2009 | High | High | Unclear | Unclear | Low | Unclear | High |
| Madhi 2020 | High | High | Unclear | Unclear | Low | Unclear | Unclear |
| Muñoz 2019 | Unclear | Unclear | High | Low | Low | Unclear | Unclear |
| Stedman 2019 | Unclear | Unclear | Unclear | Unclear | Low | Unclear | Unclear |