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Quality evaluation for Cochrane tool.
| Study | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Blinding of participants and peraonnel (performance bias) | Blinding of outcome assessmnet (detection bias) | Incomplete outcome data (attrition bias) | Selective reporting (reporting bias) | Other bias | Total quality scores |
|---|---|---|---|---|---|---|---|---|
| Song YY | * | * | * | * | * | 5 | ||
| Long Q | * | * | * | * | * | 5 | ||
| Wu J | * | * | * | * | * | 5 | ||
| Sun PL | * | * | * | * | * | 5 | ||
| Wen Y | * | * | * | * | * | 5 |
