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| New Castle - Ottawa Criteria | X Chen et al., 2021 [36] | X Chen et al., 2020 [37] |
| SELECTION | ||
| Adequate case definition | 1 | 1 |
| Representativeness of cases | 1 | 1 |
| Selection of controls | 0 | 1 |
| Definition of controls | 1 | 1 |
| COMPARABILITY | 2 | 2 |
| EXPOSURE | ||
| Ascertainment of exposure | 1 | 1 |
| Method of assessment for cases and controls | 1 | 1 |
| Non-response rate | 1 | 1 |
| Assigned score | 8/9 | 8/9 |
