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Quality assessment of the included studies using NOS.
| Study | Selection | Comparability | Exposure | Total |
|---|---|---|---|---|
| Chalmers 201722 | ** | * | ** | 5 |
| Rhee 201924 | **** | * | ** | 7 |
| Watanabe 201825 | *** | ** | ** | 7 |
| Gomide 201728 | ** | * | ** | 5 |
| Heuberer 201726 | **** | * | ** | 7 |
| Spiegl 201627 | ** | ** | ** | 6 |
| Pandey 201623 | ** | ** | ** | 6 |
| Moor 201416 | *** | ** | ** | 7 |
| Moor 201311 | *** | * | ** | 6 |
