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The quality of included Cohort Studies.
| Study | Representativeness of the Exposed Cohort | Selection of the Non-Exposed Cohort | Ascertainment of Exposure | Demonstration That Outcome of Interest Was Not Present at Start of Study | Comparability of Cohorts on the Basis of the Design or Analysis | Assessment of Outcome | Was Follow-Up Long Enough for Outcomes to Occur | Adequacy of Follow Up of Cohorts | Total |
|---|---|---|---|---|---|---|---|---|---|
| Shao 2020 | ★ | ★ | ★★ | ★ | ★ | ★ | 6 | ||
| Esen 2021 | ★ | ★ | ★★ | ★ | ★ | ★ | 6 | ||
| Huang 2021 | ★ | ★ | ★★ | ★ | ★ | 5 |
