Table 2. Quality assessment of the included articles using the standard JADAD checklist .
| No. | Article | Randomization | Blinding | withdrawals or dropouts | Overall Score | ||
| Random Allocation | Randomization Method | Blinding | Blinding Method | ||||
| 1 | Ezati-Soleiman et al22 | 1 | 1 | 0 | 0 | 1 | 3 |
| 2 | Uğurlu & Enc9 | 1 | 1 | 1 | 1 | 1 | 5 |
| 3 | Fatai et al32 | 1 | 1 | 1 | 1 | 1 | 5 |
| 4 | Imani et al36 | 1 | 1 | 1 | 1 | 1 | 5 |
| 5 | Zarifnejad et al14 | 1 | 1 | 0 | 0 | 1 | 3 |
| 6 | Tvedsko et al26 | 1 | 0 | 1 | 1 | 1 | 4 |
| 7 | Tfelt‐Hansen et al17 | 1 | 0 | 1 | 1 | 0 | 3 |
| 8 | Tvedskov et al24 | 1 | 0 | 1 | 1 | 1 | 4 |
| 9 | Tvedskov et al16 | 1 | 0 | 1 | 1 | 1 | 4 |
| 10 | Tvedskov, Iversen & Olesen27 | 1 | 0 | 1 | 1 | 1 | 4 |
| 11 | Schmetterer et al20 | 1 | 0 | 1 | 1 | 0 | 3 |
| 12 | Iversen & Olesen19 | 1 | 0 | 1 | 1 | 0 | 3 |
| 13 | Iversen28 | 1 | 0 | 1 | 1 | 1 | 4 |