| Table 2. Quality assessment of included trials | ||||
| Study | Random sequence generation | Allocation Concealment | Blinding | Incomplete outcomes |
| Badawy | Yes | Yes | No | Uncertain |
| Pasquier | Yes | Yes | Yes | Yes |
| Shaaban | Yes | Yes | Uncertain | Yes |
| Urman | Yes | Yes | Uncertain | Yes |
| Schleussner | Yes | Yes | Uncertain | Yes |
| Noci | Yes | Yes | Uncertain | Uncertain |
| Berker | Quasi-randomized | Uncertain | No | Uncertain |