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Results of Cochrane collaboration’s tool for assessing risk of bias.
| Study (Author, Year) | Sequence Generation | Allocation Concealment | Blinding | Incomplete Outcome Data | Selective Outcome Reporting | Other Bias |
|---|---|---|---|---|---|---|
| Alt, 2017 [26] | + | + | + | + | ? | ? |
| Bundy, 2004 [24] | + | ? | - | + | ? | - |
| Brinkhaus, 2005 [25] | ? | + | + | + | ? | ? |
| Lauche, 2016 [27] | + | - | - | + | ? | ? |
| Portincasa, 2016 [28] | - | + | + | + | ? | ? |
Key: + low risk of bias; - high risk of bias; ? unclear risk of bias.
