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Newcastle-Ottawa Scale of the included studies.
| Study | Selection | Comparability | Outcome | Total Stars | |||||
|---|---|---|---|---|---|---|---|---|---|
| Exposed Cohort | Non-Exposed Cohort | Ascertainment of Exposure | Outcome of Interest | Assessment of Outcome | Length of Follow-Up | Adequacy of Follow-Up | |||
| Yamamoto, 2012 | ∗ | ∗ | ∗ | ∗ | ∗ | ∗ | ∗ | ∗ | 8 |
| Arsalan, 2016 | ∗ | ∗ | ∗ | ∗ | ∗ | / | ∗ | ∗ | 7 |
| Ramkumar, 2016 | ∗ | ∗ | ∗ | ∗ | ∗ | / | ∗ | ∗ | 7 |
| Miura, 2017 | ∗ | ∗ | ∗ | ∗ | ∗ | / | ∗ | ∗ | 7 |
| Scholtz, 2017 | ∗ | ∗ | ∗ | ∗ | ∗ | / | ∗ | ∗ | 7 |
