Table 4. Risk of bias assessment.
| selection | Comparability | Outcome | |
|---|---|---|---|
| Lazo-Porras et al. (2016) | ★★★★ | ★★ | ★★★ |
| Werle et al. (2011) | ★★★ | ★★ | ★★★ |
| Garcia-Palmieri et al. (1981) | ★★★ | ★ | ★★★ |
| Crespo et al. (2002) | ★★★★ | ★★ | ★★ |
| Garcia-Palmieri et al. (1988) | ★★★ | ★ | ★★★ |
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