Table 1.
Newcastle-Ottawa scale.
| Study | Selection | Comparability | Outcomes | Quality score |
|---|---|---|---|---|
| Kang | ⋆⋆⋆⋆ | ⋆⋆ | ⋆⋆ | 8 |
| Kim | ⋆⋆⋆⋆ | ⋆⋆ | ⋆⋆ | 8 |
| Bohbot | ⋆⋆⋆⋆ | ⋆⋆ | ⋆⋆ | 8 |
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