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Risk of Bias.
| Study | Attrition Bias | Reporting Bias | Sample Bias | Measurement Bias |
|---|---|---|---|---|
| Algarabel et al. [30] | − | − | + | − |
| Andrejeva et al. [31] | − | − | − | − |
| Franzmeier et al. [32] | − | − | − | − |
| Geda et al. [20] | − | − | − | + |
| Kim et al. [26] | − | − | − | − |
| Liu et al. [25] | − | − | − | + |
| Malave [27] | − | − | − | − |
| Soldan et al. [28] | − | − | + | − |
| Solè-Padulles et al. [33] | − | − | + | − |
| Xu et al. [29] | − | − | + | − |
“+” high risk of bias; “−” low risk of bias
