Table 2. | Evaluation of the risk of bias for nonrandomized included studies, using The Newcastle-Ottawa Scale: Cohort Studies Tool [12] |
| Studies | Selection | Comparability | Outcome | Total score |
|---|---|---|---|---|
| Van et al. [4] | ★★★ | ★ | ★★ | 6 |
| Ochi et al. [5] | ★★★★ | ★ | ★ | 6 |
| Cassetta et al. [6] | ★★★★ | ★ | ★★ | 7 |
| Cassetta et al. [21] | ★★★★ | ★ | ★★ | 7 |
| D'haese et al. [22] | ★★★ | ★ | ★★★ | 7 |
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