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Jadad scale of the included studies
| Reference | Randomization is mentioned | Appropriateness of Randomization | Blinding is mentioned | Appropriateness of blinding | An account of all patients or description of withdrawal or drop out | Total |
|---|---|---|---|---|---|---|
| 1 | 0 | 1 | 0 | 1 | 3 | |
| 1 | 1 | 0 | 0 | 1 | 3 | |
| Figueroa et al. 2009 | 1 | 0 | 1 | 0 | 1 | 3 |
| 1 | 1 | 0 | 0 | 1 | 3 | |
| 1 | 0 | 1 | 1 | 1 | 4 | |
| 1 | 0 | 1 | 1 | 1 | 4 | |
| 1 | 0 | 1 | 0 | 0 | 2 | |
| Munoz et al. 2012 | 1 | 0 | 0 | 0 | 1 | 2 |
