Table 2 Risk of bias summary
Study | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|
Siu 2006 | Low | Unclear | High | Unclear | Low | Unclear | Low |
Goicoechea 2010 | Low | Unclear | High | Low | Low | Unclear | Low |
Sircar 2015 | Low | Low | Low | Unclear | High | Low | Low |
Saag 2016 | Unclear | Unclear | Low | Unclear | High | Unclear | Low |
Schumacher 2008 | Unclear | Unclear | Unclear | Unclear | High | Unclear | Low |
Hosoya 2014 | Low | Unclear | Unclear | Unclear | Low | Low | Low |
Golmohammadi 2017 | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Low |
Gunawardhana 2018 | Low | Unclear | Low | Unclear | High | Unclear | Low |
Saag 2019 | Low | Unclear | Low | Unclear | High | Low | Low |
Mukri 2018 | Low | Unclear | High | Unclear | Low | Unclear | Low |
Kimura 2018 | Low | Unclear | Unclear | Unclear | Low | Low | Low |