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Methodological quality assessment of randomized controlled trials: the Cochrane Collaboration’s tool for assessing risk of bias.
| Study (year) | Selection bias | Performance bias | Detection bias | Attrition bias | Reporting bias | Other bias |
|---|---|---|---|---|---|---|
| Sauer et al (1996)[24] | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear |
| Wang et al (2016)[26] | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear |
| Theilmann et al (1994)[25] | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear |
