Table 6. | Risk of bias in the included study (smoking habits) |
| Selection | Comparability | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 1 | 1 | 2 | 3 | Total | |
| Karoussis et al. [31] | ★b | ★ | ★a | ★ | ★b | ★ | 6★ | ||
Table 6. | Risk of bias in the included study (smoking habits) |
| Selection | Comparability | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 1 | 1 | 2 | 3 | Total | |
| Karoussis et al. [31] | ★b | ★ | ★a | ★ | ★b | ★ | 6★ | ||
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