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Newcastle-Ottawa Scale (NOS) to assess the quality of non-randomised studies
| Study | Selection | Comparability | Exposure |
|---|---|---|---|
| Yoshimura et al. (2008) | *** | * | ** |
| Gentile et al. (2012) | *** | * | *** |
| Li et al. (2012) | *** | ** | *** |
| Chang et al. (2013) | *** | * | ** |
| Peltoniemi et al. (2013) | *** | * | ** |
| Gentile et al. (2015) | *** | * | ** |
| Sasaki (2015) | ** | * | *** |
| Tissiani et al. (2016) | *** | * | ** |
| Calabrese et al. (2018) | *** | ** | ** |
| Gentile et al. (2019) | *** | ** | ** |
| Bashir et al. (2019) | *** | * | ** |
