Table 2. Quality appraisal of randomized controlled trials.
| Study characteristics | Derosa et al. [23] | Skarlovnik et al. [24] | Yasser et al. [25] | Zlatohlavek et al. [26] |
| 1. Random sequence generation (selection bias) | Yes | Yes | Yes | Yes |
| 2. Allocation concealment (selection bias) | Yes | Yes | Yes | Yes |
| 3. Blinding of personnel and participants | Yes | Yes | Yes | Yes |
| 4. Blinding of outcome assessment | Yes | Yes | Yes | Yes |
| 5. Incomplete outcome data | Yes | Yes | Yes | Yes |
| 6. Selection report | No | Yes | Yes | Yes |
| 7. Other bias | No | No | Yes | Yes |